I have a few pics of Pancho and the boys. Here's one with him and what looks like a Hotchkiss, but I don't know the detail differences between a Hotchkiss and a St. Etienne.
Potato Digger:
Colt on an improvised mounting:
And this thing which looks like the French 37mm but is described as a 35mm Mendoza Cannon:
Photos in the Robert Runyon Collection show that Pancho had a few Madsen MGs.
He also had at least one Gardner Gun, but sadly not the type that HaT has made.
For more troops, I've been thinking about the Natal Native Horse. They have bare feet and bandoliers - a good combination!