Keep in mind that he's been there for you for ten years as you've been there for him. I had a Persian like that. He only liked me, couldn't stand my wife and she would hide in a closet (the cat not my wife) during the day but at night, she'd climb up and sleep on my chest purring contentedly; I really miss that kitteh.
I'm not trying to guilt you into keeping the little guy but you've been together so long. I've had to put down many animals that the vets just couldn't save and it was torture each time.
Putting this little kitteh down because it's not convenient is wrong and it's bad karma. Either find a way to keep him, let your daughter take him or find a shelter that takes in kittehs for life if they don't find homes. Keep in mind that with the way you describe his personality, he might never get adopted but if you choose the right shelter, they keep him as long as he lives and feed him, give him affection and give him a life.
Please consider finding a way to take him with you, there's a bond of trust between you two and I guarantee you will feel miserable and guilty and you can't take it back.
If your daughter volunteers to take him, she knows what she's getting into and after a while, the kitteh will get used to the new routine.
Good luck, I think God gives us cats and dogs so we can see what unconditional love is all about. How many times have you been down and then the kitteh gives you a head bonk or the dog greets you enthusiastically when you come home? Just as God has unconditional love for us, so do cats and dogs and I don't think that's an accident. I've never met a human who was capable of unconditional love but I've seen it in every cat or dog I've had the pleasure of having.
Damn fine post Lx, my compliments.....
In full agreement with Lx. DON'T do it, at least not until you've tried the meds.
My "Cats Only" vet reports fantastic results with Prozac, especially for litterbox issues. She says it works better for cats than it does for hoominz. Generic Prozac is $4.00 at Walmart, but for a kitteh you "quarter" the pills, so once you have the Rx it'll cost you a dollar a month.
Pill Pockets make it very easy, my cat has no clue she's getting a pill.
Please give your friend this one more chance before you do something you'll possibly regret.