Again I forgot I made this post, but this is still an issue. I'm just bumping this so that maybe someday we can unlink psn accounts without completely removing our ability to do it. There is no service to do what I need done and SE and Sony refuse to help me.
They only good news is I know the PSN account name. Unfortunately they want UPCs and credit card numbers I haven't had in years. Stuck between a rock in a hard place.