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I assume your speculative scenario reasons that a stronger unified message from Britain and France in Sep 1938 would have prompted Hitler to invade the West first, before the allies had time to build up their military capabilities. Of course, Germany would first have to conquer France, which would have become the base. Any amphibious effort to take over England was highly dubious, whether in 1939 or as events unfolded. The Royal Air Force was no slouch, and England's navy was by far the mightiest in Europe.

Alternative history (if this or that happened differently) can be interesting speculation, but I doubt a stronger message from Chamberlain (instead of appeasement) would have altered Germany's strategic need to secure its Eastern front first with a relatively easy victory in Poland. It was good training for their new blitzkreig warfare. Without the Non-aggression pact with Russia, no telling what Stalin would have done. He was a blood enemy, and every bit as murderous a dictator as Hitler.

In any event, Neville Chamberlain earned his infamous place in history.

As will Trump, when his fascist regime is on the ash heap.