After spending his whole reing struggling to control his enormous empire, Charles V decided to split his inheritance between his son and his brother, leaving the Spanish Crown(s) with the lions share of both his German (or rather dutch) and Italian lands. This would go on to cause a lot of trouble for Phillip's decendants, who would spend ridiculous ammounts of money and manpower figthing wars from which they gained nothing but unnecessary enemies and a temporal preservation of the status quo. Taking this into account, it has always seemed to me that it would had been much better for both realms if Charles V had divided his inheritance in a geographically sound way by letting the Imperial Habsburgs get all of the territories within the Imperial border; that is, all of the Burgundian inheritance plus Milan.
Your challenge, should you choce to accept it, is to do exactly that: With a POD after Charles V's ascendance to both thrones, get the Habsburg inheritance be divided as shown in the map above. You don't need to keep the same people from OTL as the heirs, just make it happen.
Additionally, I'd like to hear your thoughts on how this would affect both Spain and the HRE.
Your challenge, should you choce to accept it, is to do exactly that: With a POD after Charles V's ascendance to both thrones, get the Habsburg inheritance be divided as shown in the map above. You don't need to keep the same people from OTL as the heirs, just make it happen.
Additionally, I'd like to hear your thoughts on how this would affect both Spain and the HRE.