Thanks, but I thought you were talking about Nebraska and Maine do.
I guarantee if Trump won the popular vote but either lost or forced it into the House that compact would disappear from state laws and peoples minds faster then you could say “memory hole”.
If something like that happened I also guarantee those states would discover the unusual for modern times but constitutional provision where the state legislatures assign the “electors”. They would also get a complete set of “instructions” with directions how to vote.