Anti-Bolshevik sentiments in Poland were very strong, stronger than the distaste towards the Germans, even. The chance that the pre-war government, especially after Pilsudski's death, would agree to such a proposal were very slim, at best. On the other hand, nazism was underestimated. If I can draw any conclusions of pre-war Polish foreign policy, the Nazis were considered another military junta, a thing that was commonplace throughout Europe at that time. (Poland was more of an autocratic republic itself at that time, with a Chief of State who was a military Marshal and a President with extensive powers etc.).
If Poland didn't tie itself to the Western powers, it would most likely seek closer bonds with Hitler, who - as I said - was underestimated. Anti-communist stance that Germany took at that point in time was a big factor. Poles even took part in the partition of Czechoslovakia by claiming Trans-Olza region (which was primarily inhabited by ethnic Poles though). This was the effect of the failure of Pilsudski's plans to create a big federation of Central European states (Poland, Czechoslovakia, Hungary, Romania etc.) that would act as a big state with coordinated foreign policy, aimed at deterring both the Germans and Russians from war.
But, we're touching alternate history a bit here, and I'm not entirely competent in that matter.
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