I haven't read the entire thread, but I will share my experiences with leaving a broody with the flock, and moving two different broodies. I've never had good luck leaving a broody where the others can get into the nest. Other hens lay in the nest, so I have to bother the broody every day to get the extra eggs out, and the broody's eggs always get broken. No matter where they've sat, the eggs would all disappear within a couple of weeks. I have moved two broodies within the past few years. Both got moved at night, with their eggs. I moved a bantam cochin who was sitting for 4 or 5 days, she didn't seem to care at all. She stayed with her nest for 25 days, trying to hatch undeveloped eggs (We had a rooster who was with the flock so I figured they were developed - I didn't candle. I ended up buying her some babies at the feed store.) A year later, my buff orpington disappeared and I found her a week later sitting on 13 eggs. She was in a place where she would easily have been picked off by a predator, and it was not possible to secure it. So, I moved her and her eggs at night. When I went to check on her in the morning, she was off the nest, agitated, in a completely different part of the shed, and several of the eggs were broken. I don't know if she flipped out about being moved or something got in there, scared her off and ate the eggs. That was the only time she went broody. This year's broody decided to sit in a place where I could just block her off from the other hens. Good luck! I'd be interested in knowing what you decide to do and how it turns out.