Histoire et Collections published a now OoP magazine called Militaria which went into demented detail over pretty much the entire French Army in Indochina, including weapons, uniforms, belt buckles, shoelaces (almost). It did a unit by unit series of articles.
I suspect there is still the website and some editions of the mag for back order. I think Osprey has a book on the Indochina War as well. Not sure if they do one on Algeria. The wars were "back to back". So the small differences in attire and kit would not be noticeable in 25mm.
I'm wondering if civilians could not be used from the various "spy" ranges which concentrate on 1960's movie and tv characters. A sports jacket and turtleneck would have been worn in the 50's too. So if you want 1 of your characters to be a left-wing French journalist/ spy, this might be a way to go.
RE armour: IIRC the war was more like contemporary Iraq or Afghanistan than Indochina. The insurgents used boobytraps and small scale terror and reprisal more than military tactics.
Did anyone ever read "The Day of the Jackal" by Frederick Forsythe, also a film adaptation?? It features the aftermath of the Algerian War. The French military putsched the government of France and overthrew it when the govt wanted to shut down the war in Algeria. (Emotions ran pretty high. The French had been humiliated in 1940 and then in 1951 in Indochina and the army took losing again pretty badly). The generals wanted some credibility and called Charles De Gaulle out of retirement and appointed him president. It seemed a good idea. DeG was one of the them and a nice right wing guy from an aristocratic background.
Didn't quite work out. DeG was more of a democrat than anyone thought and he proclaimed the Republic again and had the generals shot.

The theme of Day of the Jackal is a reprisal assassination attempt on DeG paid for by some of the surviving (and hiding) military guys. It's a kickass thriller than rings true to life.
It would be a great pulp scenario in and of itself.