If you can find a motorcycle magneto-I know they are rare nowadays- you can ring a very effective electric fence. It shouldn't kill the cat, well, it didn't kill the cat or the dog that were using my motorbike as a territorial marker, but they accorded the Beezer great respect thereafter. You do have to sit there until the begger comes into contact with the wire, and then give a couple of turns. Whammo!
But try it on yourself first.

One of my customers has a Burmese, a big powerful neuter. He has turned their loop-pile carpet into something that looks like an uncut lawn, and their leather suite into ragged suede.
Nice cat apart from that (says he, with a wry smile.)