Exactly what structure would the government have if the coup succeeded though? A centralized unitary state run from Warsaw would likely lead to disaster, but so would a loose and weak Austro-Hungarian style arrangement. At the minimum, the central government would need to be given control of the military, foreign policy, trade, and customs, as well as the ability to fund itself with taxes. But how many subunits would they be and what would they look like? Two subunits, one with OTL interbellum Lithuania + Wilno Voivodeship would be awkward be rather arbitrary and the Lithuanian subunit would probably have linguistic disputes. Pilsudski's idea of a three-canton Lithuania with Lithuanians, Poles, and Belarusians would be weird because it would have a federation within a federation. In my opinion the most natural arrangement would have OTL Lithuania, Wilno Voivodeship, West Belarus, Volynia, and the rest of Poland each be federal states, but that could anger the Lithuanians due to Vilnius being a separate state.