Who else could get the Rhineland post-Napoleon?

Maybe if Austria is barred from Italy, like if Venice resisted Napoleon and was a part of the biritsh coalition. The Venetian or Savoy get Milan, and Austria has to take Belgium back for lack of better options but demands the Rhineland too.
 
I think the most likely one is that everyone realises that Belgium and the Netherlands is an artificial marriage and that to create a buffer state against French expansionism they need to make Belgium more powerful--a triune Kingdom--but not unified with the Netherlands. The old Austrian design of annexing Bavaria and giving the Wittelsbachs Belgium is thus realised -- a Wittelsbach Kingdom of Belgium comes out of Versailles comprising both Belgium and the Rhineland, roughly three equal parts of Dutch, French and German speakers but in a similar climate and culture. It would be, by an measure, an industrial powerhouse, as Belgium was second only to Britain in Europe in industrialising and the Rhineland would supercharge that and also benefit from it.

Austria would then get Bavaria, which concentrates the German Catholic power; let's say that they give up Galicia for it to Russia and Russia gives Courland to Prussia so the Tsar Alexander can truly realise his ambition to be King of the Poles. Alternatively Castlereagh's effort to get the Tsar to abandon Poland bears fruit and Prussia gains the restoration of New Prussia instead with Austria retaining Galicia; in that case we might imagine the Tsar intervening on the behalf of Russia's old friend Denmark and requiring the Prussians to abandon the annexation of Swedish Pomerania so that Denmark retains this bitter fruit of the loss of Norway as well as the Duchy of Lauenberg, the Prussians being amply satisfied with New Prussia. In that case, Dutch claims could be satisfied by Castlereagh giving them East Frisia from Hanover for the sake of the balance of power, and so the trading would finish settling out. I think I like that one more.
 
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