CHINRUBS... That might be fun for the Sacrifices + Biding fight, since it's possible to get through that one via Finding A Secret. He might also be really helpful with getting angels for the party as well, along with investigative powers.

I do not know what he'd have dedicated himself to enough for magecraft (which I think he could qualify for via Multiple Reincarnations if he's able to harness skills from that!), but I think we could whomp up a Court-gift that could be good for psychometry or something else, if you want to AU for shrike weirdness! There are many ways to go....