I'd go with darkening the coop as a first step. We had roos in a small coop right outside of our house and they were very attentive to light and motion. All that it took to set them off was to see a light go on in the house. And then see one of us walk around.
And my roos will sit on their roost and crow while stretching forward. One did it this morning in fact.
And my roos will sit on their roost and crow while stretching forward. One did it this morning in fact.