Here is how you import historical players:
https://wiki.ootpdevelopments.com/in...orical_Players
Spritze passed away and is dearly missed. (
https://forums.ootpdevelopments.com/...d.php?t=322739)
His modded database is several years old now and it is likely that the columns therein do not align with the csv columns in use in OOTP26 today and so I'd guess it is incompatible for the purpose of direct importing into OOTP26.
As to the first question, I don't know how to trick the game to go back in time. Sorry.