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Say during the War of the Austrian Succession France, Prussia and company are able to decisively defeat Austria, is a independent Hungary possible (diplomatically speaking) and if so who might lead it.
Things to consider:
As the war progressed both France and Prussia became vehemently opposed to Austria with I think Frederick the Great even going so far as to claim he wished for the destruction of House Hapsburg.
Bavaria was eager for Bohemia and Austria, as their ruler Emperor Charles VII was contesting Maria's claim for his wife, another Hapsburg.
Saxony wasn't eager for a stronger Prussia in the slightest, but they were definitely willing to seize an opportunity if it presented itself, so they might go for Moravia.
France had supported the idea of an independent Hungary before
Hungary had given Maria Theresa significant amounts of soldiers during the war