I hate to hear this too.

I agree, is there any way you could tape the cords up on wall? tie all cords in one and wrap up with towels you will never use. once he grows into a little man, maybe he'd not be too attemp to chew anymore. right now he's only kitten, trust me, you could train him!

I could have you give him to me next week, I can train him then give it back to you? I'm more than glad to do that.

for holes/stratches in wall, I see onyx doesn't like being in shutroom, claustophobia(error), he would desperately do anything to get himself out.

maybe can you try cat greenies? they're quite pretty expensive but worth the long "chewing-moments".

hope you'll be able to figure out what you want soon & let me know!