The only constitutional crisis I could see arising from that is if Trump sues a state that kept him off the ballot, it goes to the Supreme Court and they rule in favor of Trump, directly contradicting the 14th amendment.

Exactly. In my opinion they’ve rigged this in the hopes of causing a crisis 3 ways out of 4 because that’s what they want. Or, at least, what they thought they wanted. Gets pretty hard to say what will happen when/if it becomes that much of a mess. Maybe the Supreme Court won’t go through with it.