Surely you can find PvB for individual pen guys vs lineups? I dunno, I've honestly never tried . I pretty much use the numbers that I find meaningful combined w eye test to rank pens myself.
Seems like PvB be kinda meaningless to use for several reasons, 1st I generally would assume manager not gonna put in a reliever to face a guy that owns him although I'm sure happens, prob mostly small samples considering how little a guy may see a reliever throughout his career let alone a year.
Obviously when you back a team you doing so with expectations they not using more than top few relievers. You going way more in depth than i ever found needed. Curious what you going for and what you come up with!