We know for a fact that neither Stalin or Hitler was interested in the idea of an independant Poland, and while making a faction with poland along with some other nations could make them last longer, it would not be enough to really make a difference since it would just end up being a hindrance until Germany takes care of France. Also, Hitler And Stalin was against such a faction, which made it impossible. Despite the Polish-Soviet Non-Aggression Act of 1932 the Kremlin joined in alliance with the Nazi Party to divide central and eastern Europe into two parts for each power to control.
[50] The failure to create a strong counterweight to Germany and the Soviet Union, such as Piłsudski's
Międzymorze, according to some historians, doomed the prospective member-countries to
their eventual fate as victims of
World War II.
[29][30][51][52]
https://en.wikipedia.org/wiki/Intermarium#Failure
At any rate, what you propose is a faction, not a country, and thus is no a major power.
I am just saying, France and England had a union, so why can't we?