Oo! very nice. Hmm...though I think you should change the king black dragon to maybe chaos element (or maybe that should be reserved for a gs quest) or gelatinnoth mother? Though I see the connection between dragons and dragon armor, it seems as though dragons are going to be extinct (or at least preoccupied) will all the quests involving them.
Also...maybe change the keys to a certain number of items dropped by the dragons/or other npcs in order to shake things up a bit. Like 100 dragonhides to ensure nulodion that you have slayed all the dragons. Just a suggesstion!
Other than that, very good idea. Hope your idea gets elected! 