Why don't you just switch the marriages of Charles and Ferdinand. So Ferdinand becomes the King of Spain (Castillia, Aragon and Napels) and have get Milan too. Have Charles marry Anne of Hungry. Once Charles is successful in beating the Ottomans, re-establish the Kingdom of Burgundy and perhaps he will retake the Swiss lands.
With Spain having no bounds with Burgundy (i.e. The Netherlands) and therefore no expensive wars the might stay in power for a bit longer than in our timeline. And if Charles and his son Phillip pays more attention to the needs/demands of the Burgundians then the "protestant" revolt might not just happen there. As for the remainder of Germany anything goes.... Perhaps a civil war and as a result you have the Empire split in a "Burgundy " catholic" part and an Austrian/Hungarian "protestant" part.
Even more fun when the Spanish agree to divide the Americas with Burgundy when Ferdinand takes the Spanish Crown.
If you decide the Habsburg not the have the Spanish Crown(s) why don't you have Ferdinand be elected as Polish King. And have him succeed in making that crown inheritable. A combined HRE Polish/Lithuanian Commonwealth would be a possible power base.
With Spain having no bounds with Burgundy (i.e. The Netherlands) and therefore no expensive wars the might stay in power for a bit longer than in our timeline. And if Charles and his son Phillip pays more attention to the needs/demands of the Burgundians then the "protestant" revolt might not just happen there. As for the remainder of Germany anything goes.... Perhaps a civil war and as a result you have the Empire split in a "Burgundy " catholic" part and an Austrian/Hungarian "protestant" part.
Even more fun when the Spanish agree to divide the Americas with Burgundy when Ferdinand takes the Spanish Crown.
If you decide the Habsburg not the have the Spanish Crown(s) why don't you have Ferdinand be elected as Polish King. And have him succeed in making that crown inheritable. A combined HRE Polish/Lithuanian Commonwealth would be a possible power base.