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I wouldn't get one just for that purpose. If it were me I'd just keep them out of line of sight from the hens and they will calm down. Hatchery Brahmas might be a bit more aggressive than pure Brahmas but they won't kill each other generally. Sounds like you have plenty of space for them, except...

Put an older cock bird in with them. He will keep them in line. I usually keep at least one past breeding prime cock specifically for this purpose. Brahmas generally don’t fight too much, too big too much effort. Edit: they’re also delicious.