Relocation is second best from learning to live with them. Relocated snakes frequently die. They don't know the territory, which may already be occupied. How would you like to be plunked down in the middle of New York City without a map?
All snakes have a home range, they are not just wandering willy-nilly. As a poultry keeper, you need to do what it takes to keep your charges safe. Try putting up a small mesh wire around the enclosure--1/4" or 1/2" hardware cloth will keep out snakes big enough to eat a Serama. 2' up will be a deterrent to bullsnakes, they don't climb much. Better yet, and free, take down and use those annoying political signs after the election--they make excellent barriers. Bullsnakes also do NOT kill or eat rattlesnakes--it is the kingsnakes that do that. Bullsnakes (gopher snakes) eat rodents, birds, bird eggs. Would you rather have lots of mice and rats around to thieve your expensive feed? They do a good service and remember they lived in the desert before humans took over their habitat. End of sermon.
I have 40+ years experience as a herpetologist....