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If you think about it the last option is a way to use login via 2fa
Nah it’s just SFA with extra steps.
But you only need one factor, access to your inbox?
So it’s more like SSO authentication
It’s all good until you get into a dependency loop with your email account passwords needing resetting, that have the email from the other account that needs resetting :P
That’s easy, just create new accounts every time you login.