We fortunately don't have any aggressive kitties.
I think the best bet is going to be three brothers that were born the end of last July. They were tested for feline leukemia in November and were neutered and vaxxed for rabies and got the combo shot last month. I think they are least likely to bother chickens since they aren't even a year old yet. One is a black mottled color with short hair, one is black and white with short hair, and one is black/chocolate with long hair and a shorter tail. He's got some funny white hair growing right now because of having ring worm as a little kitten and looks really neat actually, but I don't think the white hair will stay. They can all be petted, although the mottled one is more shy than the other two. They spent a couple of months in my laundry room in the fall, so they are used to people.
My incubator should be empty by the middle of next week. :-D But I need to check my calendar. Where am I driving to?