Doing my usual “I could get anything going but pretend to be stupid” trials Nunchuk came out ahead as the easiest by far!
Some report that seeds are backed up remotely, gotta look into that but suspect that is the paid service only.
Also it is possible to set up users for all the devices used with keys only, they’ll never get a single email address from me, not even those I buy online for Monero hahaha