I concur. Best to always email the companies, as they usually will follow with figures for both sides (usually). That said, for Black Flag figures, I suggest picking through what is available from the Old Glory Boxer 28mm range, as you will find some easily work, and the price is right.
Tonkin is one of my must-do theaters for French Colonial, and too often overlooked. IMHO, due to no real research in English (it's probably out there in French, but...). But first, I'm concentrating on French West Africa against Samori Ture, with regard to scenarios. Then maybe Tonkin down the road.