Most Plausible POD to create a united German state pre-1800?

What the title says. What is the most accepted plauisble POD(s) that could lead to a united Germany before 1800? I will accept a united and Federalized Holy Roman Empire as well (as it would be predominantly German, I believe)
 

MSZ

Banned
Either a Hohenstaufen Wank, with Barbarossa surviving and centralizing central authority in the HRE even further, coupled with that power being transfered onto his decendents after his death from old age, or a Habsburg wank, with Ferdinand II doing MUCH better in the Thirty Years War (or more better, a shorter equilivent) allowing him to bring the various HRE realms under Austria's authority. Maybe Sweden not getting involved in the war could give the Catholic League the necessary edge?
 
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