I am not very good with dates, but I will throw out a few ideas, anyway.
So, for starters, the Spanish Habsburgs don't die out...there's a few more male heirs. Then when the Iberian union happens Portugal is happier than otl, mostly because the East Indies don't get taken over by the Dutch.
Spanish forces succeed in squashing their protestant revolt, anyway, and after fifty years of conversion efforts, most of the Protestants or their descendants return to the Church.
The German Habsburgs continue to push the Mohammedans out of south eastern Europe, adding Bosnia to their dominions, whilst establishing new governments for the Danubian Provinces (which come to be called Romania), Bulgaria, Serbia, Greece, etc. Bavaria Wurtemburg and Baden pass to Austria through royal unions, but Prussia is unhappy with this and fights a war against the Habsburgs in union with other Protestant princes. Eventually the Habsburgs succeed thanks to some Prince Eugene - type figures and the British who way into the fight when France sides with Prussia...the result is that the little states that eventually made up Thuringia in otl are absorbed, and most of western Germany. Britain gets New France and some territory in the Orient (India).
Poland is divided as per otl, the Papal states are a big challenge, though...the rest of the little states were ruled by the Habsburgs at one time or another with the exception of Savoy - Piedmont, so that isn't too hard. Umm...guess that's all for now.