Here's what I would do: Trump is ordered to write a formal apology letter to the clerk in which he disavows the spurious claims outlaid in his post, he must record himself reading the letter and post it to his website for at least 2 months. Or he can go to jail for contempt of court.
This way he either does something he definitely does not want to do (admit fault) or go to jail and because he 'holds the keys to his cell' so to speak, his claims of being wrongfully imprisoned would be hollow.
Unfortunately I believe there is a long case history that prevents courts from forcing them to say things as it violates the 1st amendment. Similar to forcing engineers to write code that puts "backdoors" into security systems.
Right, my thought is that the apology would be in lieu of going to jail for contempt, so he isn't being forced to apologize, he violated a court order and is being punished, he could then choose to forgo punishment by apologizing.
Honestly this is a really great plan. It put the whole thing on him. Though sadly he would just do that sing song baby voice he uses and it would sound like he was mocking the apology