I get that, that's a larger step in chicken care. I was there myself.
You could just post him for free and just give people the heads up he's aggressive. Someone will most likely pick him up to eat him anyway.
I would eat him.
You can almost always find a rooster in your area
I don't give aggressive roosters the time of day, you can find a free rooster that's better towards you, and the hens fairly easily.