It would be possible, but that would take forever. You need to enact every reforms in order. I only have 2 so far. For every reform, you need 50 Imperial authority, which you get from baby-sitting the HRE: stop them from fighting between themselves, make sure none is annexed, help the lost sheeps (protestants, reformed) to find the True Path, etc. As far as I'm concerned, that's boring. Plus, your nation become the Holy Roman Empire, bt I prefer being Netherlands... just because.