Before all that, before doing anything, make a byte-to-byte image backup of your hard disk or two.
What would the best tool for recovery attempt be and would R-Studio proffesional version help with this case?
That tool would certainly help but since you've mentioned that it's already formatted (
hope this isn't random/zero-filled) and installed with an OS,
It's highly likely that the wallet will be corrupted upon recovery.
It's not bad to attempt it though, after you made backups.
I have spent the last few days learning about hex searches if rhe file does not appear from ordinary scan function
Yes, that a good alternative option; basically, look for the "
magic bytes" that's followed by a 64 Bytes private key.