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this is a tough challenge and I haven't got any good ideas myself about how to do it. Pre 1900 pods are fine for this aswell.
Make Austro Marxism as powerful a political ideology as possible, and have it be the founding ideology of a nation state.
It's defining characteristic is the 'personal principle' detaching nationality from bodies of land and defining it as groupings of people.
So bonus points For the extra nationalities in this state.