Jaben's already done so much for the community, I couldn't think of asking him to work for free, which is all I can currently afford lol.
In my research I stumbled across a couple of ideas, basically this is the game plan I'm going to try if I can't get a more straightforward way of doing it:
1) Upon logging in to my site, create a a Forms authentication encrypted cookie that yaf generally creates when logging in to yaf the normal way. Use my site's username or email instead of the yaf email in the cookie prior to encryption.
2) For every new register I get, duplicate the registration inside of the yaf users data table so that when the login happens yaf has some way of relating mysite.userA to yafsite.userA