Introducing pullets to flock

Long story short, my flock started with 19 eggs of which 14 turned out to be fellas. 12 of those went to freezer camp and I had 5 hens and 2 roos which I know isn’t ideal. They all got along pretty well and the boys weren’t too overly loving but I lost 2 hens within a month so I got 10 pullets to get us into a more comfortable dynamic to put it lightly.

I raise my chicks in this trough and I built this lid for it. The roos and hens are very interested in the chicks and seem to check on them daily. The hens have even been laying near them but it may just be a comfy spot.

Do you think the open lid and the inspection they’ve been doing will make it a bit easier to add them to the flock? They’re all free rangers and I was planning to just put the pullets in the coop at night when they’ve grown up but maybe it could be a bit earlier since they’re somewhat familiar? I’m in no hurry. Just curious.