Here are some ideas I've been thinking about right now:
1 - Generation of mnemonics of 12 to 24 words that show:
- bip39 seed
- Bip32 root key
- Bip32 root key
- Derivation Paths
- BIP32 Pub Key
- Account Extended Private Key
- Account Extended Public Key
You can base yourself on
ZPyWallet from @NotATether, which is the most advanced I've found so far, but I haven't tested it yet.
You can make the tool accept hardened addresses, as some wallets do not support hardened addresses.
2 -
Bip85 for generation of child seedphrases, xprivs, WIF privkeys to make seedphrases more secure to use them as Plausible Deniability.
3 - Converter of information entered into wallet file formats (electrum, .db, .json for sparrow, wasabi, etc.)