This option is not the most likely in this conference. The sense behind this is that Poland gets encircled by Fascists (Austria, Hungary, Romania) and Communists (The Soviet Union starts to expand aggressively by 1939/1940) and thus seeking either Western Integration or side with the fascist block. And Germany would veto a membership so Poland needs to negotiate with Germany. If you only want Danzig and an exterritorial highway, the chance is high, for the other options you need to make Poland a good offer.