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The Polish Corridor again. The grand dilemma of having Poland securing sea access and not having Germans grow revanchist just by looking at the map and seeing Polish territory oddly separating East Prussia from the rest of Germany.
So... Introducing the Free State of Kashubia! Danzig is included with an opt-out scheduled for a couple of decades from then. The rest is majority Kashubian (so, it could evolve into an independent country on its own) with non-Kashubian-Polish and German minorities.
It's administratively autonomous but sovereignity is formally shared between Poland and Germany: in practise, free transit for Poland to the sea, free transit between both sides of Germany. Kashubian citizens may have some kind of representation in the German and Polish parliaments.