I ran a "cut scene" game in just the opposite direction tonight -
the PCs just hit 10th. One of their earlier quests was a series of missions to recruit paragon NPCs to save the world. Tonight I gave them them the NPC paragon character sheets and told them go go kill the (low) epic villain. - It wasn't that he could destroy the world himself, but he was teaching darksun defiling magic and had founded an elite unit he was calling the Templar."
It was a terrific fight, with 2 nPCs going down and everyone going bloodied.
If I had read this article first I would have inflicted even more collateral damage. The PCs were offered the chance to come along as minions - one even accepted, but spent most of the fight waiting outside.
I set the building on fire at the end, but really it should have gone up on round 3.
We cut back to the PCs trying to take over the city after the death of its ruler, and having to take seriously the minions that survived the higher level fight. The characters also agreed to do a quest for one of the nPCs so they could get the crown the villain was wearing. One of the PCs favored allies was on the wrong side of the fight, and was killed with great reluctance by a good nPC.
One factor which made the fight lots of fun was lesser minions, who got no attack rolls, were hit automatically and posed impressively before being decimated. "Lord Grafton IV swings at you with his glowing sword - looks like he missed again"