Hello,
I too would like to get some roosters decrowed. I found a vet, Dr. Johnson, who said he can perform the procedure. His number: 909-981-2855 (free consultation w/coupon): website: vcahospitals.com
Earlier this year, someone shot and killed one of my two roosters, so I let the hens sit on their eggs, and now I have 25 roosters, black breasted red game roosters, that need homes, so I am thinking that if this procedure might help at least mute the sound, then perhaps more people, or many people, would be permitted to keep these wonderful creatures.
It may seem "cruel" to some people, but it is better to have a quiet voice and live with your hens and chicks in a "family" unit, than to end up dead in a cockfight, and be unwanted by municipal code ordinances.