Ventoy looks very useful , thanks!

I will check the Manjaro stuff out, when I used it in the past I had no complaints

Hey, the oficial way are recovery codes. The idea is that you write them down and put them somewhere physically safe.

There is another way: You can register several second factor devices. Just scan the barcode multiple times before proceeding.

Basically any old phone, that you could store somewhere safe. I got two yubikeys that are in physically different locations.

Please note that every additional second factor increases your chances to recover access, but also the chance that someone gets access to them.

By using a password manager and second factor, you are already protecting yourself very well. Where you fall on the security vs convenience vs access triangle, you yourself probably know best.