I have three cats who get along just fine with my bunny, but in my case they were fully grown when I got the bunny and we’ve fostered small animals before so I knew it wouldn’t be an issue. I would actually be more worried that a kitten would be more likely to have conflict with a bunny because they are very rambunctious and love to pounce and bite as a way of playing, and you can’t train them like you would a dog. If it was me I would opt for an adult cat with an easy going temperament. Not to say you couldn’t make it work with a kitten, but having fostered a lot in the past I think it’s a lot easier to get what you want in a pet if you go with one that you already know its personality.