Hey 114th Penn.,
I know it's a bit late for a suggestion but have you ever thought about head-swaps? I do it all the time and with a little work, the results can be stunning.
I had the same problem when I was trying to figure out command stands for my 1792/94 Lithuanian/Polish army. Then, I started fooling around with head swaps. This isn't a perfect or professional technique but it works for me. And, with a little bit of imagination and a lot of patience you can create almost any mini you need.
Here's how I do it:
(a) find a figure from the OG15s AWI British commanders set and a figure from the OG15s Lowland infantry set (or Highland set or any other figure with a Jacobite beret) – alternately, you can use 7YW French commanders or even WSS/GNW commanders – depending on what you have and what your vision for the miniature is
(b) remove their heads
(c) put a tiny bit of toilet paper or paper towel on the metal parts to be joined using Elmer's glue or similar
(d) using Crazy Glue – join the head to the body and hold it – being careful not to get Crazy Glue on your fingers
Now, from time to time, you'll notice that the Elmer's and Crazy Glue will create a blob on the parts that are joined. Don't stress – just use a file or a sharp knife to trim it away. Obviously, you want to do all of this before priming – although, I've done it quite a few times after priming and it worked out quite well.
You can also add tartans using this method – just use a bunch of rolled up toilet paper (or paper towel) in the appropriate size, drape it over a shoulder of a figure and with Elmer's Glue or similar, glue it in place – this is the plan that I have in mind for the Jacobite 'Manchester Regiment'. Tin foil (Aluminum foil) works just as well for tartans or blanket rolls, just add them before you prime the figures.
Et Viola! A Bonnie Prince Charlie!
I'll be posting several generals that I converted using this method for my 1792/94 Lithuanian/Polish army in a couple of days on my 'Battle of Viksborg" Google Photos page.
Happy Gaming!