Duh. Didnt see that. Well then... hm, yes. If the Saxon King is then compensated with the Rhineland, I guess it works.
Well, the SNL could be given to another house. Like Nassau-OrangeOr, other way round, NL go to Nassau-Orange again and SL to Louis. Something like that. The problem I have is as said that the NL were lucky enough to be just gifted land the size of their corelands at Vienna IOTL, and you give them even more!
Hm, looking at Valdemars map, how about Guelders remain Prussian, and Luxemburg is part of the Saxon compensation?
Thing is by that time (I think since the Reichsdeputationshauptschluss, not sure, though) there was no Nassau-orange land in Nassau anymore. The Orange line was given Fulda and some scattered lands all over Germany... Hm, I guess they could keep Fulda, though it does make better sense as part of Hesse-Kassel, connecting their mainland to the Hanau possessions...
Or of course, France does lose some land and Nassau-Orange is randomly placed in charge of Alsace or something. I mean, if France loses Nord it can also lose the Alsace. Its the Vienna Conrgess, everything is up for negotiations, so such shenigans can happen...
I believe you are wrong, The Orange-Nassau family had inherited most of the Nassau lands at this point, although I must admid it is a bit vague (as all of the HRE was), but around 1814 Orange Nassau line had all the lands of Nassau-Dillenburg, Nassau-Siegen, nassau-Beilstein, Nassau Dietz and Nassau Hademar (according to the Dutch wikipedia). i must admit I have no clue how big that is, I must admid that it could be a couple of scattered villages somewhere in germany. Anyway, we could give that and the lands I gave to Prussia in the west to the Orange Nassau line (If indeed Saxony is enough compensation for the Prussians).
I would like to keep Luxembourg Dutch as I plan to use it (together with East Frisia) in the future as point of conflict with the Germans/Prussians.