Hmmm, you have set off a brainstorm in my brain! I'll get to the point in a minute. I have much experience in Haiti and speak the language. There, if someone wants to nail something, they search about for a bent nail that someone threw away, unbend it with a rock, and nail it with a rock. Given this, most people cannot buy or make cages for chickens although, certainly, some can. What do the others do? Easy. They tie a string around one leg of a chicken and tie the other end around a chunk of concrete. End of story.
For better or worse, for richer or poorer, I am tied to my cockerels whom I have raised since they were about 2.5 weeks old. I cannot say good-bye. Neither will it be easy to suddenly "build" and erect a new cage to separate them, per your suggestion, although I could. Maybe I should just use the Haiti method. Leave, maybe one beta male with the flock, and pull the rest of my cockerels, and tie them up in my backyard patio with no more than a concrete block and pieces of cord, easy to feed and water, hose down the poop (I have drainage). I would then be doing the same as thousands do in Haiti every day . . .
Maybe this way I could have my cake/cockerels and eat it too (bad pun), and still separate all those males, leaving in my coop all the females and one beta male.
What'd'ya think?
Tethering roosters is common practice among keepers of game-breed chickens in parts of the US.
The practice is widely associated with cockfighting, but it's also used by respectable hobbyists keeping game breeds as a practical solution to the problem of being unable to keep game roosters together since they'll fight.