I think if anything, Wang Liu Mei would side with Alejandro or more likely, Libbons. She seems too desperate to change the world at any cost.

There's no way that the other Meistars would accept the Trinities now. Setsuna, Lockon, and Tieria all openly hate them for the attacks in Spain and Iowa (or wherever it was in the Union) against random civilians. I don't see them forgiving any of them, especially Nena and Michael.