If the society priests are looking for a place to go, look to the "old guard" that stood up and disagreed when it counted. Perhaps look to Fr. Merano, and others that were cast out on an ear, when they vocalized their disagreements. Go to the independent priests (not necessarily sedes, even better if they're not) for advice. God knows many of them have so much responsibility as it is, and would like their loads to be lightened if they possibly can be. There are many places for the SSPX priests that would not stand for such an agreement no matter how it was sliced (barring a total and complete reversal from Rome of Vatican II and the garbage that came after it, along with expelling those who would not take the Oath Against Modernism, and so forth.)
Father Berry, Father Bolduc, and others, could advise well, since they've endured much of this persecution already.