You might reconsider your original premise and find some basis for how it might work.

The British PM Chamberlain and his supporters had not entirely given up on negotiating a settlement with Germany that would save the earlier agreements. They had pressured Poland to accept most of the German demands thinking that would satisfy Hitler and preserve peace. Perhaps it is possible for Hitler to play Chamberlain for a chump a while longer?

Nothing is 100% certain in history, so while many outcomes were fairly set, through reearch can turn up suprising contradictions to the popular assumptions.

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