Earlier quoted context omitted.
I have access to the recovery email for a secondary google account but it didn't have a phone number attached so I lost it when they turned on 2FA.
Normally I resolve these things by buying all the executive phone numbers and working my way through the phonebook, but Google is the one I've had no success on with this so far.
... which hasn't happened, but maybe once every 3 months I move another service to logging in with an email on my personal domain ...