WI:Kingdom of Zapadoslavia

Is it possible for a united Western Slavic monarchy to emerge after the partition of Poland-Lithuania commonwealth and who would rule this Kingdom and would this Kingdom be on personal union with Austria, Russia or Prussia or independent?
 
Is it possible for a united Western Slavic monarchy to emerge after the partition of Poland-Lithuania commonwealth and who would rule this Kingdom and would this Kingdom be on personal union with Austria, Russia or Prussia or independent?

Independent or more likely going to be ruled by Austria. Remember that Austria had Czech and Slovak lands as well.
 
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