Recover whatsapp chat backups after reset without access to old number

I made a factory reset of my phone, which had Whatsapp linked to a deprecated phone number. Before the reset, I backed up the chats both on Google drive(*) and on the simcard (a crypt12 file). I hoped I'd be able to recover the chats after signing in with my new phone number, but this isn't happening on its own. Furthermore, I can no longer log in with the old phone number (as it is deprecated), and cannot do the number transfer. 1. Is there any way to force a recovery of previous whatsapp chats on a phone with a new number? 2. If not, is there at least a way to access the text content of the backup files (either on Gdrive, or on the sd card) from e.g. a computer, or are all the chats definitely gone? (*)*a similar question was posted here , but is unanswered and only refers to restoring from gdrive, whereas my question also mentions a local backup, and the ability to access the chats even from a different platform as whatsapp.*