Interesting idea, will think on it. But you gave me another idea: Priest of Ullric in a unit of 10 outriders pumping out 30 multiple wound (2) shots per turn. Fires 360… maybe throw in a wizard with glittering robe and/or a witch hunter to make their shots flaming or magical as desired. They might not even fight too bad in a combat.
That's a very good case for mass use of outriders and pistoliers. I don't remember if it's on this site or reddit but i saw a guy run a list of just outriders, pistoliers (like 6 units between them) and some supporting infantry and knightly orders supported by characters on warhorses (not the barded ones!) and he had a lot of success because it's very shooty and mobile.
edit: re-reading the rules, i'm not sure the multiple wounds (2) work with shooting since it says that the "model's attacks" gai that rule
it may have been because it was the first time okaying against it but it's interesting in any case