Regarding the backup email account suggestion specifically, see my other comment in this thread. That's not actually possible apparently for Google accounts set

Regarding the backup email account suggestion specifically, see my other comment in this thread. That's not actually possible apparently for Google accounts set up with non-Google email addresses as the primary email address, for some reason best known only to Google. For those accounts, Google also sets your primary email as the backup email, which doesn't really make sense if you think about it. To cap it all, there is no option to use that email for actually recovering the account, so even calling it a recovery email is deceptive.