They’re only going to take him off the primary ballot.
It would have no effect.
States are free to appoint electors as they choose, but they’re not free to set requirements to be president, those are listed in the constitution. I don’t see this standing Supreme Court scrutiny because it would open the door to all kinds of crazy schemes in the future. What’s to prevent a state from refusing to allow someone on a ballot if they don’t declare their support for gay rights, etc.?