What? Those were my suggestions. I realize they are mostly a repeat of what had already been said--I was just lining them up neatly, and agreeing with everyone else who failed to see other options.
It's sad, but the only solutions I can see are:
a) keep your own chickens in pens
b) kill the neighbor's rooster
c) ask the neighbor to kill his own rooster himself (if he hasn't already done it, he probably won't.)
d) ask the neighbor to give the rooster to you, and then once it is yours you...