some will never accept them, but many cats can tolerate harnesses just fine and will quite enjoy being taken for a leashed walk, so long as you don’t treat it like walking a dog.

You just follow the cat around, preventing it from going somewhere it shouldn’t, and if you get terminally bored you can nudge it to continue walking.

Hell you can just carry them around if they like that, or get one of those cat backpacks, whatever works.