That would be a b*tch to have to give up Hill in a trade, but I don't see any other way if the Spurs even wanted to get the Clippers attention. I still don't know the reason the Clips backed out, so I don't know if Hill would be enough anymore. I would give up Blair before Hill in this scenario because I believe Hill's role is more vital.
I don't know if it would be worth it, but it would be interesting....I believe something like Bonner/Fin/Hill/Williams works. Saves the Clips 2M this year, they get to keep their cap space for next year bc they all expire (or could next year) and they get an asset in Hill.
Getting a 3rd team would make things easier on the Spurs but more complicated overall.