Interested in French politics, certainly, but it seems to me said person would be far more Empire-focused than the Burgundians; as far as I can tell this initial core would all be in the HRE, and some Counts of Holland had been bigwigs during the whole Imperial mess untill the Golden Bull.
The dukes of Brabant (Lothier*, Brabant and Limburg) had been bigwigs too. In fact duke Henry II of Brabant originally was the prime candidate to become anti-king of the Romans (the successor of Henry Raspe of Thuringia), but he recommended his nephew count William II of Holland.
(*= continuating of Lower Lorraine/Lotharingia)
A marriage candidate will depend on the PoD and who's available and what do those who are available, have to offer. This doesn't have to be royalty or regional nobility, an heiress of an important imperial or French fief can be just as interesting.
This PoD is too late for an heiress of the county palatine by Rhine.
I mention the county palatine by Rhine, since it is important, prestigious, nearby, yet small enough to keep the main focus on the Low Countries region. It will also ensure an enduring involvement in Imperial politics.