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That ^^^ is a great article on how to do early and easy integration. We tried this two years ago and it worked well. We have chicks 12 days old already in the brooder in the run. The chick doors get opened in a few weeks. That will be at the 4 weeks age. Here is an article we did two years ago. It shows one picture where the "chicks" moved themselves into the coop. They took a few weeks inside the coop before they moved themselves up to the roost.X3 for earlier integration, gotta set up for it tho.
https://www.backyardchickens.com/articles/integrating-new-birds-at-4-weeks-old.72603/