Southern Liege even less.I can understand your point, but I'll explain why I am handing over Aachen.
-Aachen had only been part of Prussia for 21 years at this point.
-Until the coming of the railway from Cologne to Belgium IOTL, Aachen was rather neglected by the authorities in Berlin.
It is one thing to neglect a place, a completely different thing to give it up. As I said, FW IV was a romantic and dreamt about turning time back to the HRE. Aachen was the capital of Charlemagne. If the Dutch had demanded it, he might have handed this over as a prize if desperate enough, but I simply cannot imagine him offering this.
It would probably ruin your plans for your timeline, but with the Dutch being a military minnow and getting France off his back being much more important, he's much more likely to have offered Liege to the French, especially if the Dutch don't want it.
-The Dutch would not accept Liege as the prize:after all, it's a hotbed of anti-Dutch feeling ITTL and IOTL, hence the Belgian Revolution.
ITTL and IOTL they fought a war to keep the Catholic Netherlands and now they reject parts of it? A bit unlikely.
I hope that persuades you but I don't blame you if it doesn't!![]()
You see, it doesn't.