Since I'm actually in the middle of a new run through Cyrodiil, I'll give the new strategy I'm trying: Unkillable NPC followers. Specifically, the Jemane brothers. After clearing out their ancestral home at Weatherleah, I told them I'd lead them there. I've since led them all over the continent against armies of necromancers, vampires, and Daedra while I hide in the shadows because like SantoUno above, my level 20-something warrior-mage-person doesn't excel at anything yet.
Only problem: they suck at following, and tend to fight everything in our path, even when I'm trying to avoid it. I'll take to Weatherleah eventually, but until then, they're my bitches.