I'm going to go out on a limb here into something that may be unworkable, but I think it would make a great scenario for an ATL Cold War.
Say the WAllies take Germany and push all the way into Poland by the end of WWII. The Polish government in exile sets up shop in the liberated chunk of West Poland and is allied with the US/UK.
Germany is partitioned as OTL, so now you have a Western-allied salient in West Poland. Basically a massive West Berlin situation.
Possible? The Soviets would have to be significantly delayed in the North, so maybe Leningrad falls and this triggers a 1943 D-Day?