AHC: Holy Roman Empire unifies in 1848

Challenge: have the Holy Roman Empire survive Napoleon or established after Napoleon (And no, German Confederation doesn’t count), with various political reforms, and in the 1848, after either a revolution or reform, is unified under either a Habsburg, Hohenzollern, or Wittenberg.
 
It surviving Napoleon is fairly simple; 1805 goes better for the Austrians, Prussia joins the war with Austria still in the fight and Kutuzov in the field, Napoleon ground down by weight of numbers. Considerably harder is the second part, of course; perhaps an earlier Brother's War sees Prussia defeated by Austria, after which they slowly consolidate their power (possible because they have much more prestige from an earlier victory) and there you go.
 
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