I decided the following:
Tier 1 wallet (pocket money) created on Mycelium
Tier 2 wallet (monthly expenses, salary…) created on Electrum with a watching-only version on Mycelium
Tier 3 wallet (saving account) created on Electrum, then deleted. For checking amount, I'll go to blockchain.info
Of course, all wallets have a paper backup.
What do you think of this scheme?
Consequently, I do not use Armory at all. Reason is simple: I do not have the 80 Gb required to download the blockchain and host the Armory cache.
I understand that Electrum being a SPV, it has some
vulnerabilites and that Armory is
particularly resistant, but all of this counts for nothing if I can't use it. Too bad also that Armory's root key is more difficult to restore than mnemonic (and Armory doesn't even have a QR code scanner, useful for webcams).
Your suggestion makes complete sense though. I should invest in an external hard drive so that I could use Armory after symlinking the blockchain.
Why don't you just create an address on the mobile wallet of your choice, then send funds from your Armory wallet as you see fit?
I don't think you will be able to import an entire Armory wallet to a mobile wallet app. If you want to be able to manage funds on that address with Armory, import the private key (of the address created on the mobile wallet) into Armory.