I have only two standing firing poses in my 30mm collection. One of which I prefer more than the other, sort of moving firing. So when it came to making a 20mm(22mm) dolly for the firing pose this morning, I copied the stance I prefer.
The photographs show a few examples of the 30mm figures: Austrian Grenzers, Spanish light infantry, Prussian Jaegers and lastly Prussian Frei-Corps.
I think the wee figure, when cast and Milliputed should work fine.