Actually, the Germans offered the Poles a junior partnership in the Axis. The price? The Corridor, Danzig, and free passage for the Wehrmacht to the Soviet Union.
Whether or not the Poles would have considered it, Chamberlain’s [and France’s] guarantee of their borders stiffened their spine, and they turned the Germans down. Bad miscalculation on their part.
I doubt it would have made any difference in the long run. Nazi ideology made alliance with inferior Slavs, especially the Poles, a real problem.
Although they did manage to rub along well enough with Slavic puppets/allies in Croatia, Slovakia, Bulgaria, etc.