Although it lacks the convenience of a hanging feeder, a deep trough filled 1/2 to 1/3 full allows billing without spilling. I use plastic drywall mud pans, which are about 4 inches deep, braced against coop wall with a small block of limestone. Although my rooster has scratched some out a couple of times, I have had little spillage, never had a trough dumped. I have only once or twice had any poo in the trough, since it's too close to the wall for the birds to perch on, and the edges of the pan are unfriendly perches.
Since you have relatively few birds, a trough or multiple troughs like this might be a solution, if you have time to refill a couple of times a day. They are easy to clean.
Since you have relatively few birds, a trough or multiple troughs like this might be a solution, if you have time to refill a couple of times a day. They are easy to clean.