No real help here and I don't know if it is what you are looking for. We have had a total of 21 chickens at our place and at the start Pumpkin wouldn't stand them. If they came near him, he would buck, rear, kick out whatever just to get them away. He still chases the ducks around the paddocks. Maybe 1 year, he had finally learnt to live with them.
I really would just leave him (unless you are not comfortable with this), that's what happened with Pumpkin. Now the chooks can freely walk between his legs and share his dinner
That's my experience, not sure though if it would help your situation. Good luck with your new barn and chicken friends