I heard about that, I just don’t know who else can join the coalition. It might be easier to do it as an amendment if there a massive shift in power over the next decade (and I shudder to think what that’d be that was so upsetting or so lethal that the entire landscape changes to Dems having a super majority).
The NPV only needs states with 61 more electoral votes. In 7 states totaling 74 votes it has already passed half their legislatures (state house or senate but not both). So it’s actually a lot closer than starting from scratch with a constitutional amendment, which would need approval from 3/4 of all states.