Completely locked myself out - Is a reinstall & restore from backup a solution

Hi all,

I managed to completely lock myself out of my sophos xg. :-/
(I used 2FA for my admin account, but due to a lost/replaced phone I also lost my sophos authenticator config.)

The only solution I can imagine right now is reinstalling sophos and restoring my current config from one of my weekly backups. Is this a feasable solution? Do I have the option to change the default admin (or general user) credentials during the restore process?

If not: What is the right approach in a situation like this?

Thanks a lot in advance.

Regards
 Chris