I don't know how many different poses Dr. Bussler produced, of Hessian casualties, but you are correct, you can fit them into Seven Years War displays very easily.
There were just some auctions up on eBay this week; one was for the grenadier, wounded, falling back. Another was for a casualty lying on his back, but that may have been a Continental/British infantryman. Looking for them now, I think they've ended, because I can't find them. But eBay is a good source.
Jack Scheid was another American pioneer in military miniatures, a contemporary of Bill Imrie and Clyde Risley. Scheid produced a catalog of Revolutionary War figures, and his Hessians can also be used for Seven Years War figures. His sculpting style may look a little off compared to what is available today, but painted, they don't look bad at all. I heard one collector who knew Jack describe how he created a master by carving a block of lead-certainly an interesting way to go about it.
Jack produced the figures and a diorama of the Battle of Lexington, that used to be on display at West Point, I think. There are photos of that and other of his dioramas and figures in the older toy soldier books.
Here is an auction for one of his kits:
https://www.ebay.com/itm/54mm-Schei...368480?hash=item3ae58da520:g:f5kAAOSwKytZKFWj
I have a couple of those in my gray army, as well as some other of his Hessians. The molds still exist, too. But though there were discussions about continuing his line, they never concluded successfully.
If I can find the auctions I saw, or new ones, I'll share them back here.
Prost!
Brad