I have 2 bantam mottled cochin roos that grew up together and get along famously. They are in a coop with just 1 small standard hen...a white Langshan that doesn't lay anymore. They don't even try to breed her but they do protect her and call her for food when out in the courtyard.
When we turn everyone out into the courtyard together, the roos are in with 12 18 week old standard sized pullets...RIR, BR, light Brahma, etc...AND 2 silkie roos and their hen. (One of them is most certainly either gay or metrosexual and respects the hen's rights...he never even tries to breed and rarely crows)
They all get along with no problems but the bantam cochin roos cannot breed the standard pullets...at least at this point. I really don't see them "helping out" in anyway.
Short bottom line: I'd put him in with his own girls. He may or may not breed them, but he'll be a great protector and feel like a "man among women".