When I first had chickens, I bought some meaties by accident - well, I honestly didn't know what I was doing. But anyway, the male meat bird lived a long time. He killed two of my hens when he was trying to mate with them because of his size. He wasn't being mean, he was just doing what roosters do.
Anyway, now that I know what I'm doing... I am raising my first batch of meaties this year. I do plan on separating them because they need a higher protein content. I have meaties and layer chicks brooding together right now, but they will be separated shortly. I plan on butchering them before they try mating, so I don't think that will be a huge issue this time.
Can you put up a temporary wall? I have used green plastic 4' wall that I bought a Home Depot. It was pretty cheap. I don't think the meat birds will fly around too much! Then when I'm done with the meaties I'll be able to remove the plastic pretty easily.