OP, I'm so sorry this is happening to you. I understand that you're hurt, angry, and frustrated, and you have the absolute right to all of those feelings.
But I'm afraid people are right when they say that pranks, etc., aren't going to help your cause. It won't stop him from hurting you, and it will just make it more awful as you'll feel more powerless.
I would just be entirely clear to him: "I know what you're planning to do. I don't want this marriage to be over, but if you do it, you know that it is. Think about that before you make decisions that are going to change your life, and my life, for the rest of our lives."
Frankly, I wouldn't give him that kind of power; I'd tell him that going on this trip meant the end and that you were done. But if you can't, I would be calm, clear, and painfully dignified.