mirocu, I love your ability to ferret out an old thread that, not only has a valid and interesting premise, but let's us see what was said long ago.
Acadian, in his quest to evaluate if Oblivion was 'fit for elven consumption' completed all the quests in the game at least once. He only completed the MQ once. Although I loved the MQ and found it both fulfilling and touching, it left a definite feeling of . . . finality. It did indeed seem awkward to go from Champion of Cyrodiil to Potato Hunter or Rat Slayer.
We worked some Acadian magic into Buffy's neverending story in Tamriel. She lives in a post-Oblivion crisis world, but it is the late Savlian Matius who is the Hero of Kvatch, and Sir Mazoga who is the Champion of Cyrodiil. There is no statue in Bruma and no one has ever called Buffy any sort of hero or champion. It works wonderfully for us.