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We're going to eat them as soon as they start crowing.Just a question, what are you going to do with the 50% rooster chicks? Knowing what purpose the animal will serve will help us guide you better.
There won't be much there if you butcher when they start crowing. I had one start at 3 weeks (although, this is rather uncommon) and another at 7 weeks. My guy now is 13 weeks old and has been crowing reliably every morning for a few weeks now. Most people butcher dual purpose breeds at 18-20weeks. There are chickens ready to butcher at 6-8 weeks, but those aren't something you can really propagate in the manner you are wishing to pursue.
I say australorps because they are outstanding layers and have a good feed to egg conversion whereas the BOs eat more than what they are worth (in the eyes of many).
I really like the look of BOs though.
What you could do is get a Cochin or two for broodies and have a flock of leghorns or some sort of production breed or hybrid for the eggs.
Some production birds go broody too, so you really can't predict what kind of individuals you're going to get.