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Prussia at the end of the Napoleonic War controlled Belgium and Rhineland. During the Polish-Saxon Crisis the Prussians tried to gain Saxony and give the Wettins the Prussian Rhineland. One natural issue was that there was a desire for there to be a Rhenish watchdog staring down the French.
So here's a thought: a Wettin Kingdom of Burgundy comprised of the Southern Netherlands (including Zeeland and Limburg), Prussian Rhineland, and Westphalia.
The Dutch are compensated with Friesland (previously Prussian), Emsland, and Heligoland.