Well, isn't the current setup in KR close to a nonsense?
As stated by others, it's in current setup more close to Flanders-Flanders than Flanders-Wallonia.
Couldn't it be possible to implement some changes there? Actually, German occupation of French Flanders and the occupied part of Artois was a time of propaganda towards the olds roots and links with Flanders and other low-countries provinces. It's highly probable that had Germany won the war and had Germany choose to stay with a sort of Belgian state, they would have detached northern France and transfered them to that Belgian State. And it would add some French-speakers making the "Wallon" part more relevent. So, what about adding some provinces to Flanders-Wallonia?