I think the codicil that states appoint electors by whichever manner the state prescribes makes the faithless elector laws constitutional. The constitution deliberately says that the states can make up their own rules on the subject.
But in my mind, since the states are directing electorates to vote in different ways, and not always with the popular vote of the state in all fifty, they are ignoring the popular vote in different states enforcing different theories so there is no consistency with the use of the electoral college for a federal election. If the electoral college was forced to vote coinciding with the popular vote, there would be no need for them. And until a set of rules is adopted by the federal government to direct the voting actions of the electorates, who are not part of the state when voting for a federal election, then there will be no control of the elections due to state interference and not electoral voting. 3 USC Ch 1 sac 8:
“§ 8. The electors shall vote for President and Vice President, respectively, in the manner directed by the Constitution.”
It does not say the states can force electorates to vote any way at all, yet many states are doing it. And others are not.
rwood