Neat picture.
A tough one about the Major.
I have a few Dixon Mexican riders but they are waving guns.
Also checked a few packs of Cowboy Wars figures, same problem.
Trying to find a figure just standing is going to be a problem.
The only other line of figures is Foundry.
You might look at their Maximillian line MAX001, French or Imperial Command.
Hope you find one, would be cool.