I'm surprised that ALPA allows US to participate in KCM which they helped develop without ANY help from USAPA. I can assure you, USAPA would be too petty to return any favors (as if they had any to offer, except dragging down the "market rates" and making negotiations more difficult for everyone.
I doubt the TSA would have gone along with the program if we had tried to exclude certain pilot groups from it for political reasons.