Are you sure your other cats won't accept him? Maybe they just need a little time. Can you maybe keep him for a while anyway and give him and your others a little time to get used to each other.. You could shut him in a room away from the others when you're not home.
I have three disabled cats like that: two with Cerebellar Hypoplasia (a neurological disorder which sounds like what your kitten has) and one with cockeyed hind legs as a result of kittenhood fractures, plus four other able-bodied cats. They all get along fine.
What your disabled kitty needs is a controlled environment, i.e., no stairs, open windows, or other places to fall from. Since he is otherwise healthy, he needs no special care.
It is amazing indeed that he has lived this long outdoors!
If you absolutely cannot keep him, there are a number of good suggestions here of places that can help.
Best wishes!
I meant," said Ipslore bitterly, "what is there in this world that truly makes living worthwhile?"
Death thought about it.
CATS, he said eventually. CATS ARE NICE.
-- Terry Pratchett (1948—2015), Sourcery
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