Cool. When can I have another location or backup provider on my Android phone?

Hard disagree. I do not want to have 2FA for every shittly little thing I do not care about.

QR codes are just an encoding. Just use any half-competent QR code app, and it will give you it’s content, which you can then write down. For the reverse you can use any QR code generator.

… or you just work in 3D …