AH Challenge: The Habsburg War

Your challenge is to create a war between two branches of the Habsburg family during the 17th century. How could it be done?
 
As one of the resident Habsburgophiles, I will be the first to say that obviously this is totally and utter impossible. :p

But in all seriousness, a war between the Austrian and Spanish branches of the family is going to be incredibly hard to create. A war between the two branches would more or less destroy several hundred years worth of carefully crafted Habsburg tradition and myth, something that is likely neither side would have wanted. Plus it's just not practical, who the frick are the Spaniards gonna marry if they don't have female Austrian cousins?
 
I'll twist the challenge, if you permit me. In 1568, just before being arrested by his father, Don Carlos was in talks with Dutch agents to carry him to the Netherlands. Apparently he planned to be declared Duke of Burgundy, Brabant etc. and declare war against his father Philip II. That makes a Habsburg war, though only between members of the same line: Philip II of Spain and "Charles III" of Burgundy. There is a chance even that Carlos would convert to Protestantism.
 
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