WI, after their success with the Sudetenland, the Nazis decided to further Greater Germany by pressing their claims on Poland instead of invading the rump of Czecho-Slovakia? How do negotiations proceed without that example of bad faith?
I think this would require the German Foreign minister to be someone other than Ribbentrop, but who? That would mean no pact with Molotov, and German foreign policy would continue to seem more anti-Russian than anti-British.
What price would the Western Allies be willing to let Eastern Europe pay so that they could stay out of a straight fight between Hitler and Stalin?