mccmeadows
Songster
we have a small bantam cross raising 3 orp chicks right now - they’re already as tall as she is and half her size at a few weeks old! I’m crossing my fingers that one or two of them are hens that I’ll keep in the hen house and I hope they’ll be Foxy’s bodyguards for lifeI would be Leary of mixing bantams with an established large flock...but you might be much more successful if you mix chicks of large fowl, and let them grow up under bantams? Those constantly broody hens, give them some chicks to raise.
I think that the BO would be a good choice, BA's or barred rocks would be a good choice, but really I think just being raised up under and established flock might swing it your way.
Mrs K

to OP: our main hen house is a very mixed size flock and a couple of our smallest girls are at the top of the pecking order. with proper integration/raising, I don’t think you’ll have a problem. picking a docile bird may make things even easier as well!