Sorry but your pictures have cheered me up no ends, not helpfull I know but your allready doing the horse community a grand service by cheering us lot up?
My welsh Section A used to do this all the time when he lived out, so I know where your coming from, I used to get him in, groom them all...
I do a semi deep litter with both of my boys, big (17h) and small (10.2h) When I say semi I remove droppings each day but only remove the wet when it comes to the top of the firm layer which is about 4" thick, I put a new bag(s) of wood shavings (which are non standard type but not dusty) in...