Couldn't think of a better title.
Your challenge, is to have Germany keep all or at least some of the territory it lost after WWII, with a POD no earlier than the Nazi invasion of Poland. Why? Because I always liked how Germany looked like it was nomming Poland.
Hitler chokes on an artichoke on September 3 1939.
Nazi bosses have a spat that seems likely to destabilize the country, therefore, the generals move in. Goering, Himmler and Hess have an aircraft accident and die.
Von Brauchitsch or Beck become interim head of government.
Stalin, seeing Germany weakened, does not move into Poland.
The French launch their major offensive on September 16. They make little headway, yet they manage to nibble some more German homeland ground, which strongly worries the German population and government.
The Poles, not undermined by the Soviet attack and encouraged by the French one, manage to maintain their "Romanian bridgehead" in the South East of their country. The British and the French strong-arm the Romanians into letting supplies move through their country, from the seaports to that Polish stronghold.
On September 28, the Germans launch a final attempt at dissolving the Polish stronghold, but fail due to faltering morale, shortages of 37mm rounds for their tanks, the fact that the Luftwaffe has largely redeployed West to help contain the French thrusts, and the fact that the poles now defend much shorter lines.
In November, the German government asks for a ceasefire. Negotiations follow. The German position is that the Gleiwitz casus belli was real, but that it was blew out of all proportion by Hitler, now gone.
The final settlement gives Poland only Danzig, plus very hefty reparations and formal guarantees concerning the safeguards for Polish minorities in German border regions. Since Danzig was not part of Germany in September 1939, so that's not a problem. Probably the Germans do lose something else, that was part of their territory, and that's Memel, annexed from Lithuania earlier that year. I'm afraid that the British and French will be satisfied with Czechia regaining independence, and won't insist for a restitution of the Sudeten.