The DemocRATS already have named their candidate. My guess is that they would not be able to change the name on the ballot if state officials refuse to change it.
Yep. And that is the only consequence. The name on the ballot. But, the party is still on the ballot, and a vote for the party still counts toward the (already chosen) elector. Get enough votes, the party picks the candidate. Don't get enough votes, it's a moot point.