My rooster is aggressive towards people. But LOVES his hens! We were within a hairs' breath from culling him, but a bad hatch saved him ... if you like, here are the details ...
http://mydouchebagrooster.blogspot.com/2017/02/coq-au-vins-sentence-of-execution-is.html
I was thinking just a separate area IN the coop until the hatch is done and a day or two after to judge the flock's reaction ... with three broodies, that would be tough. Fortunately, with THREE protective mothers, I don't think the rooster would be inclined to get too close!
I'd say the best thing you could do is isolate the mother and eggs where she sits. Fence off the small section of the coop where she is, enough for her and babies to be secure from anyone going in or coming out. Have their own water and chick feed available inside their mini enclosure. This will...