I can only share my experience with having two broodies in the same coop at the same time.
I had a SF and a silkie go broody at the same time. Actually I had 3 broodies but the third one quit halfway through. We had gone on vacation when they first started setting, leaving my SD as their caretaker. SD got confused on what to do, the result was all the eggs under the hens being bad (non-hatchable) except one. The silkie had managed to hatch one chick and was ignoring it while she continued to sit on the bad eggs. I went to Atwoods (like a TSC store) and bought 8 chicks. That night, after all the other birds had gone to roost, I swapped out the bad eggs for day old chicks; giving the SF five chicks and the silkie three.
Both hens accepted the chicks right away. Three days later both mama hens brought their chicks out to meet the flock and free range. The mamas were very protective of their own chicks, but would lightly peck at the others chicks if they got too close. One of the silkies chicks was killed in a freak accident, but all the others have done just fine and are now close to laying age.
So far I have had 5 clutches of chicks raised in the coop with all the other birds and it's worked quite well. The silkie is currently setting again. She has two modes - raising chicks or being broody; there is no in between with her.
Hope this helps.