North Star carry a few Brigade figures, don't know if they have these, drop Nick a line and ask?
Caliver carry Knuckleduster.
I seem to recall that at least some of the FR Spanish wear sandals.
Another option, Trent/Stratagem (North Star probably the best option) have French in Ireland (1789) figures. Irish rebels are quite a motley crowd, but big figures, so they might look like they've been on steroids next to OG. One or two might be ok as "beefy" recruits. They also have Haiti rebels, which are useful as rebellious slaves (when the British burnt the White House there was a panic in Virginia that it might spark a rebellion).