Mash can be fed wet or as is.
You can always ask the mill to grind the mix differently. Maybe they can mix it larger or crack the grains. Maybe add a little molasses to bind the ingredients.
Most mills will grind the feed the way you prefer it.
How many pounds do you order that they'll grind it the way you prefer? I guarantee they'd laugh me out of the store if I asked for special accommodations for my 50# per month.