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I always wait until one of 2 things has happened. Either I am sure the hatch is over, or mama brings them off the nest. If I am sure the hatch is over, I lift the entire nest (when possible) or at least move them one by one (gloved) to the floor. My experience with mama bringing them down is....she will make her own new nest.
Can I just add one more thing? when my broody hatched out her chicks last year the nest box was about 8" off the floor, I am pretty sure one of the chicks fell out of the nest box, I really don't think she pushed it out, anyway when i found it it was cold and I thought dead, but it moved slightly so I put it back under mama and watched till rest were hatched then got that nest on the floor. Your right stony mama made her nest and all was well after that. Chick made it.
I always worry about that. That's why I try to move them 1st. It just doesn't always work out that way.
I also try to put up some form of barricade to prevent them from falling out.
I find newborn chicks can barely scale a 3 inch barrier, so I don't know how well they would handle a ramp. I've thought about tyring it, but haven't yet....