I had this happen to me 4 weeks ago now, my broody hatched 2 babies and one didn't and she kept getting up, so I took the egg and put it in the incubator at 37 degrees Celsius and humidity between 55% and 60%.
It hatched 2 days later and I then gave it back to momma chicken! She took the chick...
You may need to re home 2 drakes, they tend to gang up and your girls are going to be exhausted. Separating does help but from my experience they will find a way out, they want a mate too, they may just mate with each other also lol