Still sounds awesome!
In order to make the scenario a bit more balanced, one could have it set up so that once Communist France becomes the European Communal Federation through post-war events, pan-federation independence movements sprout up all over the place the moment dissent hits, say, 10%. Once any country declares independence from the French-led federation, a flag is set, let's call it EURO_CHAOS, that triggers the independence events for Austria, Hungary, Bohemia-Moravia, Slovakia, Croatia, Bosnia, Ukraine, Belarus, Germany/the German states, Denmark, Switzerland, Poland, Serbia, Romania, Greece, Bulgaria, Belgium, Netherlands, Lithuania and Livland within the next week or two. It'd be fun seeing whether France could fend off an assault from all of an extremely-irritated, freshly-independent Europe at once, especially considering that a good number of her divisions would be trapped WELL behind enemy lines... It's be like the Revolutions of 1848 all over again, except much more violent.
And then, once France/the Federation is defeated, the alliance between all the rebel nations would be dissolved via event, and the countries would have to look at one another and say, "alright, what do we do now?". Much like the aftermath of the Yugoslav wars, there'd be many territorial disputes due to the nature of how all these nations were reborn. The continent might even tear itself apart in a nationalist fervour despite having united against the Syndicalist French just months prior.