My persoanl opinion is that without DALPA, ALPA fails. Period.
It is a good threat, and one that need to be taken to the national level.
Not sure if it is the best answer, but it is one that should be put on the table. That said, with these two groups not unified, a throwing out of ALL of the LEC reps and a new election of MEC officers, my solve you issue. Fact is that you get to live with what they have done, even with a new union!