Will do. I'm trying to get my hands on another device.
BTW, I saw that Electrum has an Android app, would that suffice as the third setup? A mobile phone that is air-gapped. Or that app has limitations?
Yes there is limitation between electrum desktop and the android. The limitations I can recall it’s users complain about are lack of coin control but you can freeze addresses, it doesn’t have the manual customization fee except you use the static slider and then doesn’t sign messages. So i don’t think it would be possible to run another co-signer on it. Other phone wallets like BlueWallet are better but the problem would be to importing the electrum seed phrase into BlueWallet because electrum doesn’t use the BIP39 seed phrase.
But if there is a way to create an electrum multi sig wallet using the BIP39 seed phrase rather than the electrum seed phrase it self it could be possible.
Let me tag @o_e_l_e_o to shade more light if it is possible