Approving competing slates of electors is a good idea, even though it doesn’t change anything now. As things currently stand, it is clear that neither the courts nor Congress are going to stand in the way of Biden being inaugurated. If, however, fraud were proved on such an enormous and obvious scale between now and Jan. 6 (or perhaps Jan. 20) that even the Supreme Court or Congress could no longer ignore it, having Trump electors already appointed in the key states could prevent inaction due to a technicality — i.e., you wouldn’t want the Court or Congress to say, “yes, Trump actually won PA (or GA etc.), but since no Republican electors were selected on Dec. 14, the best we can do is invalidate the Biden electors and leave the state with no electors.”
I understand your point, and we need to be prepared for this and get our best legal scholars out there.