That is a great point. I imagine it would fall on the certified vote as designated by the state.
And do we include the votes of Territories?
But that's not going to work.
The next step in this process, and I guarantee it's coming if this is allowed, is that California and New York will not allow Donald Trump on their 2020 election ballots.
Since there is no "voting" in the Constitution for President and Vice President, if New York and California pass enabling legislation saying that voters for Electors for President and Vice President must choose from political parties registered with the State Social Justice Board, I cannot see how that could be subject to a legal challenge.