I think the raising with the flock, depends on your set up and space. I always raise mine right in the flock. But my run has multiple roosts, boxes, barriers, feed bowls and hideouts. I also let mine free range most of the day.
I have tried moving broody hens, and found it did not work for me. Just leaving them alone, and letting them handle it works best. My broody hens have been aggressive enough that no one lays in their nest, (in fact they tiptoe in to not irritate her) and all of mine have been willing to take your arm off at the elbow if you reach for her.
I do try and give her some space at the point of hatching, mostly by locking the layers out, rather than moving her. Mine have always nested about 3 feet off the floor, and once she is satisfied with the hatch, she creates a new nest on the floor. Then I let everyone back together. She gets them out of the elevated nest without help from me, and no one has been hurt.
Works for me, and mine.
ps I have had several of the buff o go broody for me.
MrsK