WI: Kaiser Wilhelm I assassinated in 1861

IOTL, right before his coronation ceremony in early 1861, prussian Kaiser Wilhelm I was almost assassinated by a student, named Oskar Becker. But what if he had died that day and was succeeded by his son, Frederick III, who would have been Kaiser at the age of thirty, rather than fifty-seven?
One thing is for sure: Otto von Bismarck would have never been Kanzler.
I would also guess that Frederick, being a liberal, would have been either neutral or covertly/implicitly supportive towards the Polish January Uprising of 1863, which could have interesting effects.
What else from here?
Would a different Congress of Princes in 1863 lead to a more liberal Prussia?
What happens to the Schleswig-Holstein Question?
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