In a TL I never got around to finishing (mostly because others beat me to some of the ideas, and school limitations, and whatnot), I had Alexander institute a few changes a few years earlier than OTL (due to a realignment of ideas and alliances following a CSA victory).
Russia undergoes a much more liberal evolution and a power struggle ensues between Alexander and the nobles who have the most to lose from his proposals. With most of the military backing Alexander (not all, mind, as many officers were nobles), and a vast majority of the civilians, Alexander wins out over his rivals, even stepping down in the wake of the civil war to allow for a new election for a Prime Minister type person.
Here's where I got hung up because my imagination only goes so far...