Besides Judenstaat there's a book about a Jewish state in Alaska.
I think the Germans could've been talked into giving up some land for a Jewish state at the end of the war. It could've been presented to Germans as the right thing to do, everyone could see the Jews needed their own state so they could defend themselves. It would've been a good thing for the Germans to help out.
And we wouldn't have all that Muslim anger about the Palestinians today.