[endenduser]

I want to restore one of my old gmail accounts. There's a recovery mail address set, but I can't access it neither. That one is not gmail.

I can'r re-create this address, since the site says the address is already registered.
-so I'd like to ask whether is possible to create a clone of my non gmail mail-address to receive the recovery/reset mail from google?

[Lynx]

Spoofing doesn't work both ways. You can't "spoof" an email and receive emails there. Spoofing is done by altering headers in the email client.
What you can do, is go and check public databases like weleakinfo for password recovery.