Unironically I think the land we cleared of Germans to give to Poland and Russia would have been better as a Jewish state if we really had to have one. On top of using the land of the people being punished for the Holocaust instead of an unrelated third party's land, it's around where most European Jews had lived already anyway.
Of course that doesn't take into account that Europen countries supported the Zionist project precisely because it got all the Jews to leave Europe.
TBH, the idea that there must be a Jewish state strikes me as a loud and open admission that if the St.Louis was out there today, people across the world would still insist they be turned away.
Right now the policies most of the NATO-aligned powers have towards boats full of people fleeing war zones to claim asylum is to ram the boats and shove the survivors in prison camps.
There was significant majority of non-German population in case of Reclaimed Lands to the Poland there were 5,1 million people of which only 500.000 were Germans and 4,6 million were either Poles or minorities close to Poles like Kaszubs or Silesians.
I don't have the exact data about East Prussia but around 1900 over half of population spoke Polish as first language and good chunk of rest Russian or Lithuanian. Later that % dimished significantly because of very active germanisation there. In 1944-45 population diminished severely because Germans and volksdeutches there got pumped condensated red scare and were running away like rats.
In short, on the western Reclaimed Land you would build same opressive entity you have now in Palestine and in East Prussia it would be hellish hot spot unless socialist and integrated into Warsaw pact, which was not an option west would accept.
I really don’t think Jews would be treating Poles the same way they treat Palestinians. But in 1945, when this process would have taken place, many of the areas ceded to Poland had very little Polish population. And most that were there were in Upper Silesia, so Poland could have just kept that. The rest of the territory ceded to Poland was primarily repopulated by Poles fleeing the Belarusian and Ukrainian land Poland had stolen in 1921, not Poles that were already there.
Regardless, that’s if a Jewish state was really necessary, which idk.