Supreme Court decision would be necessary to determine if this is constitutional.
On the one hand, the Constitution gives each state legislature absolute authority to determine how its electors are chosen.
OTOH, the Constitution prohibits compacts between states without permission of Congress.
Does this thing fall into the category of prohibited interstate compacts? I have no idea.
Of course, if Congress were to agree it would be indisputably constitutional.
Great minds and all that.
I think it would because the trigger for the law to go into effect is for a majority of states to agree to the scam. In other words, they have entered into an agreement with the other states.
That's true. But a legislature cannot choose a method that undermines the intent of the Constitution. For example, a legislature can't decide to put its electoral votes up for sale to the highest bidder.