Yes, it's possible.
Although Electrum's "seed version system" is different from BIP39's checksum, both are using the same wordlist when generating mnemonics.
So an Electrum seed has that chance to be a valid BIP39 seed.
(electrum doesn't rely on a fixed word list to create a seed but currently uses the same word list as BIP39's)

However, if he used v4.1.3 or later versions of Electrum to create the wallet, there's no chance that it'll also be a valid BIP39 seed because they excluded such results when generating seed phrases.
https://github.com/spesmilo/electrum/pull/6001

My guess is you're selecting the wrong option when restoring the seed phrase. Should be in "Standard wallet->I already have a seed" and not in "Import bitcoin addresses or private keys".
If not and you're using the correct restore menu, there's something wrong with your seed phrase.

When typing the words, try to let Electrum finish each word by selecting the correct word that will show while you're typing.
If the word isn't being displayed while you're typing a few characters, chances that it's incorrect is high.
Alternatively, see if your seed's words belong to this list: https://github.com/spesmilo/electrum/blob/master/electrum/wordlist/english.txt (use "search")

Add server=1 to your 'bitcoin.conf' file in bitcoin's data directory, restart Bitcoin Core and see if the "Disconnected" notification is gone.

As for the database, let it finish first, and if it doesn't do anything within hours.
Check the logs "Armorylog.txt" and "dblog.txt" in Armory's data directory for errors.

How about the logo's color?

It's important because the former is an indication that it's a Regtest/Testnet paper backup while the later means that it's for mainnet.
The former wont restore the same Wallet ID using that tool and it is essentially worthless aside from testing purposes.

Yes, it will prompt you to double-check the restored Wallet ID if it matched the one in your backup.

The tool works at my end;
Any chance that it's actually a "SecurePrint™" backup instead of unencrypted (just edited)?
What are the colors of Armory's logo in the paper backup? Green+Blue or Red+Blue?

There shouldn't be any problem with 1sat/B fee as it's follow the standard rules.
It shouldn't be dropped from mempools either since the size haven't reached the default maximum within this past few days.

I think it was just an issue in your connection to Exodus' server at that time.

It simply means that it's not in their node's and other nodes' mempool.
Since it didn't arrived in your Electrum wallet, then the selected server doesn't have that transaction as well.

There can be a lot of reasons but let's start with your Exodus wallet where the transaction is created:
try to do a rescan - https://support.exodus.com/article/75-how-do-i-refresh-my-wallet
Since the transaction isn't in any mempool, it could be removed after a rescan, then you can re-send it again to your Electrum.

That tool should work but it can only generate legacy addresses (P2PKH),
if you've used the other address types in Armory before, then your only option is to use Armory to restore that backup.

Note: When copying your root key into that tool, paste it one line at a time or it will restore a wrong wallet.
(9 set of 4 characters per line - 2 lines like in the backup).

There's a great chance that the tool is working as intended if the restored "Wallet ID" is correct,
in brainwalletX's Armory tool, it should show up above as "uid: xxxxxxxxx"

Use the "Check Node" button under 'Join the network'.
Your IP Address should be automatically detected but if not, manually type it along with the correct port.

AFAIK, there's none.

You can use the command suggested by hosseinimr93 to import a private key or importaddress to include its associated transaction(s) to the wallet.
If you're planning to use this method and there's more than one address to be imported,
I'd suggest to use "false" 'rescan' flag for the first few (so it wont scan right away) and "true" on the last.

Bitcoin Core has RPC commands: createrawtransaction to manually create a transaction and converttopsbt to convert it into PSBT.
Neither require the UTXO set nor blockchain to use.

Reference: developer.bitcoin.org/reference/rpc/index.html

Thanks, I previously edited it from "4 vMB" because I decided to use "Weight Unit" instead but forgot to add "million".

Blocks can be lower than the "maximum" block size (currently 4 million Weight Units).
Most of the first thousands blocks are empty and the rest (until Bitcoin became famous) only have a small number of transactions included,
so their size are only a few kB.

For example: Block #1000 doesn't have any transaction in it aside from the coinbase txn; its size is only 0.216 kB.

Is this about Electrum's 2FA?
Because I can't find any topic about 2fa wallet with a seed phrase in your post history and you didn't tell from which 2fa wallet is this about.

If it's Electrum: the 2fa is there to protect the "wallet file", which is in a PC/Phone, which is an online vulnerable environment.
The wallet file doesn't contain the seed phrase or your second master prvKey so it's useless on its own without the 2fa authenticator if accessed by hackers with the correct password.
In this case, a non-2fa electrum wallet would have been hacked already.

The seed on the other hand is air-gap, in a safe offline environment, so the only way to compromise it is to have physical access to it.

Again, you have answered neither of the users' questions because saying "you found 1 or 4 address" doesn't make sense unless you specify how you found them.

But anyways, there is a way to test and try if your seed phrase is invalid for having a wrong character and to find if it has a balance:
You can import it to Electrum by toggling "BIP39 seed" in the option during the restore process.
It will show "BIP39 Checksum: ok" below the seed if it's valid (with very small error margin).

Then in the next window, clicking "Detect Existing Accounts" will prompt Electrum to check the mostly used derivation paths if any of them are funded,
it will display a list if there's more than one funded 'account'.

But take note that it's only for Bitcoin not Altcoins.

This part looks convincing, I'll settle with "average" then.
But I can't help but think that there should be a factor to consider when discarding half of the list so I'll do my research on "chance" in general.

Thank you.

---

@notphus Pardon for the going quite off-topic; that was just about the small chance of your seed phrase's "good checksum" to be false-positive.

Okay, and all of those count in the 1/16 chance because it's only based from the last 4-bit, including the non "gravity" ones.
So actual chance to get a valid seed phrase when "scrambling the 12 words" will be a lot lower than 1/16 since most of those "other words" aren't in any of the 12 words to be scrambled.

Well, the tricky part is while the checksum is only the last 4-bits, the last word is influenced by the last few words because each word is equals to 11-bits.
I'm thinking that while it's true that the checksum last 4-bit "0000" has 1/16 chance, some of those valid mnemonic phrase's last word can't be "gravity" because there other words that end with "0000".
That's why in that scenario where the words are scrambled, we should be computing the chance based from the number of words or at least it can't be 1/16 chance.

Note: 816 - 'gravity' is actually "01100110000".

Yes, always 1/16 if we're talking about the 4-bit checksum and the entropy, it's simply because a random 4-bit can only have 2^4 combinations.

But:
In which case, we can't use the entropy to compute the chance.
And I doubt that the chance is constant for every 12 word seed phrase since the each 12-word combinations can have lower or higher chances than the others.
So it's hard to give an accurate rate, but I doubt it's still as high as 1/16 in this case.

BTW, we're not helping in solving OP's case 

Yes, you wont be able to create another account if the previous one is unfunded.
support.ledger.com/hc/en-us/articles/4404389482641-Add-your-accounts?

The question is for us to find out if he should be restoring the seed with derivation path account level higher than 0,
the "4 addresses" may be from his first or next accounts.

His previous response "found 4 addresses" doesn't make sense as a reply to my previous post so I guess that the seed phrase doesn't have issue;
but he never answered that last question yet.