Just create a single bloody list based on DOJ and tag each crew as CX or KA, you want transparency then DOJ it is, it's the backbone of a seniority system, then let the union's not the company come to a solution that's agreeable for the future, negotiating with the company only ends up in a reduction of terms. Perhaps then stuff like vacancy bidding can come to fruition without the seniority list screwing it up and again leading to negotiation with the company. Wrestling with a pig comes to mind.