Effects of a Poland allied with Austria instead of PLC

I was thinking what if Casimir III had a son and an alliance between Poland and Austria was made against Bohemia while an alliance with Lithuania is done against the Teutonic Order, what would be the consequences of such alliances?
 
I was thinking what if Casimir III had a son and an alliance between Poland and Austria was made against Bohemia while an alliance with Lithuania is done against the Teutonic Order, what would be the consequences of such alliances?

Why not just put a Hapsburg who does not rule Austria on the Polish throne, and then unite the crowns at some future point?
 
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