I have had Dutch bantam broody’s hatching and raising chicks on 3 occasions. Tried different things and recognise almost everything in you’re article.
Marking the eggs is a really good tip!
One to add: if you want a broody, let 4 or 5 fake eggs lay in a nest of you're choice in spring. Chances are great you have a broody within a week on the right spot.
And one more: best not to have a stair or steep slide to climb up the nestbox. Chicks have no troubles getting down the stairs but often don't get it how to get up again in the beginning.
My experiences:
1th time I got 3 broody’s on one nest. After one hen started to breed the other two joined in. Cozy but not okay. I split the broody’s over two nests. Two broods on one nest with 7 eggs and one broody on a new nest with 4 eggs. This went all well until the first eggs hatched and chicks came near the other broody
She pecked the tiny chicks. Do I moved her to another spot. Separated from the two mama's with the chicks.
There was no problem to move her because I had a bottom of carton box under the nest. I picked her up complete with the nest and the eggs. MDH helped me to prevent the broody to leave the nest.
Next time I rebuild the coop and added a laying nest for the other chickens and separated the chickens after a few days of trouble. I finally let one broody breed alone on the eggs.
The third time the 2 mothers who did well on one nest did this again, only now on a separate and bigger nestcoop with a run of 6 m2. I separated the two broody’s as soon as it was clear they take their job serious. They did a great job. I had no trouble and mother and 5 chicks had plenty of room to grow up.