Do a run. It's easy to build and the chicks won't get eaten while they learn what is dangerous. The other chickens will be able to see them and get used to them so they won't get attacked when you put them in. I always use a run and it has worked like a charm every time. I have a rabbit hutch with plywood on the sides for a windbreak and i just prop the door open with a rock and slid the run so that the hutch opening and run opening meet. Then you have a run anytime you need it, for a hurt hen that needs to be by herself and you would rather have her stay out with the rest of the flock for example. I think a run would be best.