What if Sweden regained Great Power Status in the 19th Century?
I'm thinking France partitions Prussia and gives Sweden Pomerania. Sweden trades Pomerania to Denmark for the Crown of Norway. The Crown of Norway here including Iceland, Greenland, and the Faroes.
Sweden avoids peeving Napoleon as well, sticks with the continental system, and thus doesn't lose Finland.
Later, holding much of OTL constant, Sweden involves itself in the eventual defeat of Napoleon and thus is able to make gains at Vienna. West Prussia might work, as in Napoleon's theorized Prussian partition Russia was to get East Prussia and West Prussia was to go to Warsaw. I imagine it'd be referred to as Swedish Pomerelia.