I agree, simple is best. I only have six chickens right now, going to end up with eight or 10. So I ferment in one bucket, toss out spoonfuls in the morning, then toss out spoonfuls in the evening. Sometimes I put it in the black rubber feet bowls, The ones that are about 4 inches high and around 10 inches wide. They don't walk through it, they don't kick anything out of it or poop in it or try to stand on it. The bulls are cheap and easy to clean.
I did see a picture of a feeder once that I did want to try. It was just a 6 inch PVC pipe cut in half. No end caps, no stand, just laying there on the ground. If the chickens try to step on it it rolls. It would be very easy to clean. I haven't been able to find that picture since of course. I will keep looking for it and posted if I find it.