Best POD for Federalized HRE?

I was wondering, and while I've got a funny feeling I've asked this before, what would be the best POD to create a Federalized Holy Roman Empire?
 

Eurofed

Banned
Federalization is a modern concept that requires 18th century constitutional systems, when the HRE was in its death throes.

What you might mean, I surmise, is the best PoDs for a centralized HRE. In such a case, a string of fairly successful, talented, and longeve Ottonian or Hohenstaufen Emperors, with no dynastic crisis, that spans a century or so may do the trick. No premature death of Otto III or Henry VI would be a good start.
 
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