He sounds like my Fiver. Tbh, Fiver was like this because he was kept in a cage that was too small for him. He is very intelligent and active, I've never met a rabbit that is so bent on destruction. My friends even call him "The demon bunny!" because of how norty he is. :lol: He was constantly trying to get into places he wasn't allowed, chewing things he shouldn't, bar biting every time he was shut in his cage etc. Because he associated the cage with being bored and ignored, he now can't be caged at all. Even bonding him in a pen was a nightmare because he was bar biting and getting very, very upset.
He now free ranges in my room. This has by no means solved the problem, he continues to cause havoc :lol:. My Mam left my door open once..and the door no longer shuts properly because of how much Fiver chewed it. :roll: He's also chewed by bed, jukebox, furniture and he even ate some money once! :lol: Tbh, the when Fiver fixates on getting somewhere, the only thing to do, is either COMPLETELY block it off so there is absolutely no way he can get into there, or simply let him go there. I have the bare minimum in my room, with absolutely no wires on show. I have only one electrical object in there, all my furniture has plastic edging on to stop chewing, and I have even had to put laminate flooring on the walls to stop him chewing them.
I know that the reason he is like this is because he is super intelligent and also because I caged him when he was a baby. It is my fault that he bar bites and gets a bit neurotic when shut in anywhere.
Even a large pen is seen as "evil" by Fiver, and I physically can't age him. Only recently have I managed to introduce a dog crate into my room with the two litter trays in. This is the first time in about 3 years that I've had a cage in my room...and so far he has not bar bit. He is NEVER shut in the dog crate; the door isn't even attached, I want him to associate it with nice things if, for some reason, I need to confine him.
Tbh, the best thing I ever did for him was to get him a friend. He now has two girlies to cal his own, and he is SO happy.
The only thing I can suggest with your bun, is maybe use a different cage? If your bun hates going into his cage so much it's because he associates it with bad things, is it not possible to shut him in a room that you can completely bunny proof until you can put him outside?