After the Belgian revolt, it would be relatively easy for Luxemburg to end up German. It wasn't connected to the Netherlands and the Dutch barely cared for it. It is possible to sell them off or something like that, kind of the opposite of the Dutch king trying to sell Luxemburg to France.
Limburg, different story. Limburg was simply put part of the Netherlands. It might have been officialy part of the German confederation, as compensation for the loss of Belgian Luxemburg, but in reality Limburg was just as much part of the Netherlands as Zeeland, Friesland or North Holland was. The Dutch government would never sell it to Germany, just like France would not sell French Catalonia to Spain. There was barely any interest for the peoplein Limburg to join Germany (although there were some who wanted to join Belgium, but no majority of the voters as far as I know). So in short, Limburg is never going to be part of Germany peacefully. A war is possible though, kind of like the Schlesswick wars with Denmark, if Germany would actualy want it. Bismarck actualy did ask for Limburg at one point. The Dutch government said no and it all ended there. Why, because Germany would lose too much in a war ith the Netherlands. Sure, they could easily overrun the Dutch army and defeat them in a war. But they would lose something far more important, a secure western flank. The Dutch were relatively pro-German and fiercly neutral. As long as Germany would leave the Netherlands alone, nothing would happen. If they go to war with the Netherlands, they would know the Netherlands would be driven into the French camp. Better to have a neutral (even pro-German) Netherlands and being able to use those Dutch ports, than a pro-French Netherlands and never be sure that Alsace-Lorraine is the only place those French soldiers can show up.
Also about Tallyrand plan for splitting up Belgium, I always doubt that plan would work. There was a reason the Prussians lost all lands connected to the river Meuse. In the end I think that even if some variant ofthe plan would be used, I think the Netherlands would keep Limburg and Prussia would end up with (just) Lucemburg and part of Liege province(oh and I think Antwerp would end up Dutch anyways, since the British don't want to be forced to be invested in the continent).