I clean 3 times a year. I don't have poopy eggs & I have 3 roosts in a coop about like yours! I guess it's all how you can deal with it. I stir up the bedding every couple of days & add new when needed.
& I leave my windows open 24/7 all year round with HVAC filter stuffed in there in the...
Don't worry too much, you'll figure it out, it's not a make or break issue.
What if you took that back roost down & moved it to the other side, by the next box - same height as the other one but put a leg under it in front of the man door, or maybe with a hinge for easier clean out.
I have a...