Nice words, but I wonder how the average French soldier or worker would feel about being told that they're fighting for the sake of the German workers.
He probably would spit his wine out and ask the commentator to repeat! We had Jean Jaurès trying to take that road before, and the results were the Union Sacrée against le Boche.
But well, if the internationalist revolutionary fervor and zealous indoctrination that we witnessed in the Soviet Union in OTL managed to blossom in France, there probably will be workers absolutely convinced that they are every working man's brother... So if the Commune remains Leninist, it could work - if it turns Stalinist, it probably won't.