it wouldn’t need any constitutional changes

You need a lot of states to change their laws. Some states ban faithless electors unless the candidate they pledged for dies. So unless we’re yeeting the candidates off a building in order to stop fascism, you can’t change your electorsl votes.

Also, if you’re method of avoiding fascism is by relying on the electors to keep their promise, you’re ending up with disaster.

In the 1800 US presidential election, the system at the time was that 2 votes are cast by the electoral college, the one with most votes is the president and the with the second-most votes becomes president (stupid system, right?). Electors of the Jefferson-Burr ticket was supposed to have one of their electors vote for Jefferson, but not Burr, so that Jefferson has just 1 vote more than Burr, making Jefferson President and Burr vice-president.

But NONE of the electors did that. They all voted for both, which resulted in a tie, resulting in a contingent election. (They later added an amendment to make Pres and VP two separate vote counts, which we have today)

I don’t have faith in Electors to make good plans. Although Electors are handpicked hardcore supporters of a candidate, sometimes their fanaticism can make irrational decisions, including even ignoring instructions from the candidate they supposedly support. (For example: Some Sanders supporters did not vote Biden in the General election, even when Sanders endorsed Biden)