AHC: Bismarck as a federal prince

In our timeline Bismarck was made Duke of Saxe Lauenburg when he was retired. He didn't like that though.
How could he or his descendants become a federal prince of the empire? Maybe as Duke of Alsace-Lorraine or if Saxe Lauenburg gets independence from Prussia. What do you guys think
 
Otto von Bismarck, Chancellor of Prussia and the German Empire and Count of Alsace-Lorraine :openedeyewink:

The name of the ship "Graf Bismarck" will be correct in this TL
 
In our timeline Bismarck was made Duke of Saxe Lauenburg when he was retired. He didn't like that though.
How could he or his descendants become a federal prince of the empire? Maybe as Duke of Alsace-Lorraine or if Saxe Lauenburg gets independence from Prussia. What do you guys think
Maybe If a Prussian provincenis given to hin, that used to be an autonomous territory. Fürst Bismarck OTL had been given the title Prince, despite him not being a prce, although habe had been of higher nobility.
 
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