Rehoming is a very very very last option. People that tell others to rehome are poorly informed and pretty much don’t give a crap about their pets. A lot of factors come in to play. The time it happens, where is the sun, other animals around, etc. etc.
People state that the no crow collars are dangerous. Well, some of us take our risks. Are there are many things we do that are dangerous with pets but we still do them. Perhaps the rooster just isn’t adapted to the no crow collar. Something else he can do is build him a darkbox. That means in the evenings you separate him from everyone else put him in his dark box don’t let any light get in and let him out in the mornings.
There’s perhaps one or two more things you can do. I can’t remember them at the moment. It’s always a good thing to ask because there are quite a bit of very informative intelligent people here. But it’s also always a good idea to look elsewhere, check the Internet, ask around for other possibilities of what you can do. Opinions are opinions just like everyone has a hole on their bottom. You get good advice that’s actually good and may be helpful for it could totally suck for you. Or you can get very bad advice and run along with it and doom yourself. Best thing to do is investigate, research, and apply new methods. Detectives and scientist do it all the time. There’s gonna be some failure and some learning curves, but eventually you’ll find something that works best for you even if it’s rehoming.