Re-introduction to hen

A hen was sitting on 12 eggs.
She started sitting on 5 then added the others while sitting.
Three hatched and the hen stopped sitting and is content with the three.
I placed 7 eggs in the incubator to finish the hens abandoned job.
They should be hatching a couple days apart from each other if all goes well.
I had one hatch this morning.

So my question here is what to do with the poults?
I am going to let them dry off first but then was thinking how to re-introduce them to the hen and the other 3 poults.

At what day should I do this.

As soon as the poult is dry?
After day one?
After I see the poult drink?
etc.

The other poults are about three days old and are little mountaineers.
Climbing over big rocks, going into the tiny spots around bush's.
I don't want the new poults left behind.
Should I lock then in the coop to make sure they all get re-introduced properly until the last one is hatched?

What have other done in this situation?

 

Plan "A"
FAILED
Result:
death