You could move the roosts over closer to where the camera is in this photo (I assume that's your access door where you're taking the picture from?), so the closer roost is close to the door (I think 1 foot away was the optimum distance, but whatever you have room for that will give them room to maneuver), and the farther roost moves to where the closer roost currently is. Then you can open up big vents where the holes are now, and attach a vertical partition down from the ceiling to block off direct drafts blowing towards the chickens. Sort of like this:
View attachment 1936250
Even better, close the holes currently across from the camera, open up a bigger vent where the holes on the left side wall are, and cut out another big vent across from them on the right side wall up near the top. So you get a cross breeze between the two walls to move air around, but nothing is blowing towards the roosts, and the partition should keep any remaining drafts from blowing on the chickens.
Wouldn't that be the same as just moving the far roost?
If roosts are moved I definitely recommend making them removable so cleaning is easier.
The height limitations definitely make things more challenging.
Tossing a CRAZY idea out there.........
maybe build a coop off the nest box side that is a 4x8 walk in style.....keep the current coop minus the wall into the run making it a covered porch for the birds......
I know it sounds hard but it really would open up a world of better options.
May be currently cost prohibitive but a long term plan perhaps....