BASSA were never going to negotiate any deal for the MF
It seems ironic as one of the points for negotiation NOW is to discuss MF terms and conditions...a little bit late for that.
Perhaps BASSA should have accepted that this was going to be a reality and actually negotiated either better Ts and Cs for MF, or (as you suggest CCCP) designed an integrated system that was going to give BA the planned savings (long term) and that was an acceptable balance for current crew . BA put forward an integrated option (which I believe could have been tweaked through discussion and negotiation) but it meant giving up some of our current agreements.
So whilst BASSA were up in arms about the smoke screen of imposition, BA's baby has sailed right on in, just how they want it.