First off - IANAL, merely a reasonably well-informed citizen so bear with me on any errors on law or precedent. I particularly note you make no comment as to how Bush v. Gore in 2000 bears on this where SCOTUS did intervene in a state-level political question.
I next take note that the doors you leave open in your closing are effectively non-optimal when viewed towards potential success. So it’s just bend over & kiss it all goodbye???
I see this as a different issue - rampant cheating by, for example, the Democrat machines in Phlly and Detroit. Not the unfairness of the rules themselves as in Bush v. Gore, but rather a failure of the State legislatures of PA and MI to (ultimately) step in an apply the only Constitutional remedy (appointing a slate of electors to the EC). Since they didn't do that, it's a "political question." And then again, I don't think SCOTUS wants another Bush v. Gore and are looking for a way to punt.
Like I said, I hope I'm wrong.