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I like the idea of putting one of the mid-sized in with the littles to start.
These almost-3-week-olds have been brooded right next to the mid-size in a divided off area so they've been next to each other from the beginning. The little divided-off pen is going to kind-of be a challenge figuring out how to make an escape they can find but the older chicks can't get through. I'll have to do some thinking on that.
The overall pen they're in is attached to the indoor pens that the adults are in. It was made with wonderful little adjustable doors that the chicks can go through but not the elders. However, since there are 2 ages in it this time, I have to re-figure how to accomplish this with 2 sets of chicks that themselves need to be combined.
Have to thank @azygous @aart and probably a few others for the chick portal idea that I read before we built the chick-safe pen. We incorporated several variations of it on the pen and I love them. I'll have to post a photo of the one we are currently using. It is a sliding door that slides from left to right and can be adjusted to various width opening.