[BirdWatcher]

Just finally started getting myself engrossed in a fictional league and reached the anticipated day of the early May draft pool announcement for the new player draft. And it was historical players (well, upon further review, not all historical rookies, but most of the best players available (Harold Baines, Vic Wertz, Jose Abreu etc.)) Not my intention. (Found somehow in setting up the league I had checked on "automatically import real historical rookies" and "use random rookies from all eras." I already have an historical random debut project I enjoy but I really only want fictional players in this league.
I've already become attached to my team and this league. Is there any way for me to purge the league of these historical interlopers and replace them in this draft pool class with fictional players, as I intended and not have to start from scratch?
Thanks so much for any guidance you can give me.