Another subject: Burgundy. I have seen this has been slightly commented already but I am a little dubitative at to its limits and even inclusion within the scenario.
1/ Burgundy was conquered by the Franks at the fall of the Roman empire - ethnically, linguistically, at all levels it is extremely close to the Kingdom of the Franks which would eventually lead to France. The heart of what was to be Burgundy for centuries until absorption by France is France-Comté and Besançon; it has sort of always included the Lyon-area, and has extended its reach to Flanders and Provence but only through mariage and vassalage, not military conquest or "colonization".
2/ Flanders was only part of Burgundy for 150 years, starting end of XIVth ie very late in your scenario. Flanders had a vibrant history of its own before it was part of Burgundy, after and up to today. Moreover, it is distinct from "Frankish culture" quite significantly, at least linguistically - which is not true for the heart of Burgundy.
3/ Burgundy has been called for some time Kingdom of Arles and has indeed included Provence (a good chunk of south-eastern France). But only for 100 years, breaking up as early as 1032!
4/ after that and until roughly mid XIIIth, Provence was not a vassal of Burgundy anymore and was either independant, or claimed by Toulouse, or by Barcelona (Aragon). From the end of the Crusade vs Albigeois (1229), basically the Franks establish a domininion over both comtés de Toulouse (south-west) and Provence (south-east) though officially the latter will only be fully integrated into the kingdom of France in 1481.
All in all, to me, the Burgundy inclusion makes little ethnical, cultural and historical sense though it does fill in a gap politically. I have contested Toulouse being given in 1075 to the Franks, and the same goes of Arles certainly. Ghent is to the Flemmish and Besançon ended-up until very late (XVIIth) under Germanic control. If you removed Burgundy completely you could have space either for the Flemmish, or another Italian civ (Genoa-Savoy), or create Occitanie (Toulouse-Arles, basically all southern France which spoke langue d'oc, a distinct dialect of French).
I would be happy to discuss all this further, but given the span of the map and the very strong identities each people is supposed to represent, somehow Burgundy does not fit in IMO.