Well the British were fed a great deal of pro-Belgium war propaganda for five years and the French would tend to back the Walloons over what the the suspiciously Germanic Dutch. I can see them letting it slide.
Suspiciously Germanic? Were the stereotypes back then of wooden shoes, windmills, and tulips not still pretty big? I don’t see why anyone would think of the Dutch as malevolent. And if people bring up the Dutch East Indies, I am sure people would think of the Belgian Congo as well. I think some of the other maps of territorial Expansoin of Belgium after WWI work better, as it shows the various railroads and rivers they would get extraterritoriality on. If the Belgians simply got more assured duty free movement of goods into Antwerp (while is why the coastal area on this map is shown) was given, with the Dutch being given Frisian lands and such, as well with assured free passage down the Rhine, maybe it could pass. As it is?
Well, going by the Wikipedia page, for what good it is, the Dutch army was always mobilized and there were a million Belgian refugees in the Netherlands. Belgium is likely to be in a famine situation still, and the unless we have the Belgians start claiming the refugees are being massacred as fifth columnists(not a term yet, I know) then... No, doesn’t make sense either. Really, they just is no way for this to happen. It is like the maps of Dutch clams after WWII. Despite feeling betrayed after taking in so many starving German children as refugees during the interwar period, they did not desire to dispossess people to gain their land. Or to have so many Germans. It Belgium does annex Limburger, might as well give them the territory in Germany on the other side of it too.
en.wikipedia.org