The best way to handle this may be to have ECUSA split into two structures: one that is orthodox and fully part of the Anglican Communion and another that is heteodox but in the Anglican tradition. Each diocese would then vote, as a diocese, on which one to join. That diocese, along with its missions, chapels, camps, and other "common" property would become part of the group it chooses. Next, each parish would decide to either follow its diocese or be transferred, along with its property, to a diocese in the other group. In the space of about six months, the whole mess could be settled without a single lawsuit.
Did you mean "Episcopal" in the latter?