I have some polish, but my rooster got hit by a car a while ago. He played chicken once too often.
Mine would go broody and hatch a few out. I lost 3 to a feral cat. One still lives a long life.
The other one I got originally, a hen, she has also raised a chick with success, but zomg the dad was a naked neck and so is the baby. Hope it is a boy so it can cross back and go polish, cause right now, I can't get pure polish. Live far from more polish boys.
****************One thing I can see a lot of you are forgetting is the required gut bacteria.**************
every part of health in both chickens and astonishingly in humans too is determined by the 95% of cells in our body that do not have human DNA (or chicken for that matter). The chicks always require to eat the sh1t of the flock to get the bacteria working inside them. They cannot digest food without it. As you are all going from hatcher to brooder then you have a recipe for death that would play out as you have written it up. You can raise polish and they do go broody and make good parents in my experience. They just can't take cars head on is what my preliminary studies have found.