My 2-of-3 vault I'm trying to set consists of:
- a Desktop electrum at one house
- a Trezor at another house
- a Mobile phone electrum (most of the time on me)
I guess idea behind your set up and wallet locations is you will always have access to 2 or 3 co-signers at one of your two houses. It can be a combination of Desktop and Mobile Electrum or of Mobile Electrum and Trezor.
But each of them has by default: a passphrase (or a PIN for the Trezor), a words seed. So, you multiply by 3 the cumbersomeness of this configuration.
Can I spare myself all of those? What do you think?
I don't understand your questions! Spare, what do you mean in this context?