4) If in these 4 states there is a conflict where the Governors/Secretary of State (i.e. the normal process) decide to send electors based on the unconstitutional vote, and the state legislators want to send their electors, then ...I believe that SCOTUS can rule that the entire national election "lacks integrity" and then the election must go to plan B.
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5) Plan B per the Constitution - Each state (i.e. 50 votes total), based on the majority of each state's legislature, gets 1 vote on who is the President. There are 27 Republican controlled states, 21 Democratic states and 2 undecided. So Trump would be elected this way.
Conceding, for the sake of argument, that Trump is a "hot mess" who has nevertheless done great things for this country (such as nominating three conservative Supreme Court Justices who, one hopes, would make pro-life decisions), this is definitely the "Lepanto option".
And remember what happened there.
And how it happened! To the beads, friends, to the beads!