It's doubtful that the Nazis would have stopped with the Sudetenland. The hyperbolic description of Bohemia and Moravia as a dagger embedded in the bowels of Germany would still be made, and taking full control of that dagger would certainly be done.
This is an assumption, although my idea is also an assumption. I say Goering was much more realpolitik and economically minded then Hitler and would see the value in stopping there and reproaching with the West to prevent a total economic collapse.
Even if the Nazis had been content with just the Sudetenland, it's doubtful that Poland would agree to surrender their rights in Danzig or allow an corridor separating Pomerania from the rest of Poland.
Even in exchange for Germany guaranteeing their independence and forming a defensive alliance against the Soviets? The UK and France have literally nothing to offer in regard to Poland's security. The Poles are well aware of this. Also it's possible Goering doesn't bother to lay claim on Danzig or the corridor anyways. Danzig is of very limited value anyways and the Poles can likely be convinced to agree to the extra-territorial rail corridor.
The reason Poland didn't worry about Germany until a couple years before the war is that the German military was a pathetic force until Hitler began rearmament.
Times have changed and the Poles know this. They either need to side with Germany or the Soviets, and Germany is the only serious option of these two.
Had Poland stood with Czechslovakia in 1938, it's likely they would have defeated Germany had the Nazis made good their threat of invasion, even without Franco-British assistance.
That's all fine and good, except the Poles were too busy collaborating with Germany to dismember Czechoslovakia to begin with
. A fact that is often forgotten.
Avoiding World War II as we know it requires the Nazis to take actions it is implausible they would take. They were trapped by their ideology. Only if an internal struggle prevents them from going any further after the Anschluss is it avoided, but even then that most likely only delays until 1940 the outbreak of war.
It's not that simple. Goering is much, much
less radical then Hitler/Himmler/Gobbles. Goering's political base will be the military and industrialists, not the SS or the Nazi Party. He will be concerned first and foremost with his personal power and maintaining the German State.