Yeah, if I make my own I may go that route (though there isn't much info on making those, either).
I already have the pickups that I drew into Illustrator (which is why I wanted to know if they'd work, but I guess I could go with some different ones. The only 7 string rail pickups I know of are the X2N-7's. Maybe the 7 string Blackouts but I want to stay passive.