This would take a while, but you could try clicker training him, or the equivalent by using a special command. Here’s the idea: he does NOT get the treat when he acts this way. You say a command like “sit” or “Calm”. A word you never use any other time so it’s special. Be still until he stops being crazy. As soon as he is calm, say the word and give him the treat, saying “Good boy!” Do this every time for his treat. He will see that the other 2 get their treats by behaving calmly. He will NOT get his when he acts out, but he will when he behaves calmly, or the way they do. Bunnies learn fast.
You do not need to use any negatives. Simply do nothing until he does something you like, and give him a positive. It works when negatives don’t and he will learn that it’s what gets him a treat. The command word is a signal so he doesn’t learn that every time he is calm a treat is coming.
This is calm + command = treat.