East Prussia, are you serious? You would have to ethnically cleanse the area of Poles as well as Germans for that to work. Historically they around number 3 in antisemitism behind Nazi Germany and Russia. That is about it.
Ehh, they live next door to people who threaten to drive them into the sea OTL. Jews as a people are pretty thick-skinned about that sort of thing. They kind of have to be.
That and I was thinking more along the lines of “incentivize Poles living in East Prussia to move.” Telling a Pole living in East Prussia, “Hey, we know your homeland just got the hell beaten out of it, but we’re moving a bunch of beleaguered Jews here. But take this amount of cash and move eastward and maybe have a better life” will get a lot of Poles to say, “eh, what the hell” and take the cash. Especially if they didn’t already own property.
For me, the real wrinkle would be that the new Jewish State would probably be behind the Iron Curtain or divided.