In OTL on the night of 30-31 August 1939, Ribbentrop had an extremely heated interview with Henderson, who objected to Ribbentrop's demand given around about midnight that if a Polish plenipotentiary did not arrive in Berlin that night to discuss the German "final offer", then the responsibility for the outbreak of war would not rest on the Reich. Henderson argued that the terms of the German "final offer" were very reasonable, but argued that Ribbentrop's time limit for Polish acceptance of the "final offer" was most unreasonable.
What if the Germans had given more time and with British pressure the Poles agreed to return the Polish Corridor to Germany.
Where would Hitler have turned next and what of the rest of Poland?