I'm surprised I haven't seen this in any other timelines, besides ones where there's a French government-in-exile in the colonies or something. How could you come up with a geographical division of metropolitan France between "traditional" republicans (so not commies or syndicalists or some other radical faction) and French monarchists of any stripe (including imperialists)? Is it because Paris is such an important power base that France doesn't divide nicely like German, Korea, etc. do? That when Kingdoms and Empires and Republics get replaced in French history, the losers usually don't try to rally to a secondary capital, and the most you get is Paris seeing a bunch of local revolts?