When recently reading about the history of Cologne, I was reminded how unpopular Prussian rule was in their new possessions along the Rhine and, to a lesser degree, Westphalia.
Basically there were two influential and dissatisfied groups:
a) The catholics did not like the fact that the monarch was protestant and his bureaucracy was mostly as well. Lutheran officers and/or officials marrying local catholic women and deiciding to raise the childern als Lutherans were a big problem.
b) Liberals did not like that compared to French times local democracy and self-government was severely reduced and there was way too much micro-managing done by people sent from Berlin. Prussia being one of the most strictest German powers when it came to censorship of the press and persecution of dissent certainly did not help.
So, basically the PoD is: When revolutions start in France and proto-Belgium, the also start in the western provinces of Prussia.
AFAIK, the biggest Prussian garrisons in that area were in Wesel, Koblenz, Cologne, Jülich and Minden.
On one hand, without foreign help the revolution will be crushed, if not by Prussia alone then with Austrian and other German help.
If France tries to help the revolutionariesin order to gain a client state along the Rhine, the GC treaties will force Austria and the other german states to fight France anyway.
And Russia is certainly chummy with Prussia and Austria in that time.
On the other hand, Russia has its hand full with the Polish uprising. A more widespread Polish uprising might even affect Prussia (and Austria) enough to give the Rhenish a fighting chance ...