It's not a bad idea. There was an attempt for an Uber Jedi in the NJO series - not a clone, but the son of one of the Emperor's cocubines - Roganda Ismaren. I don't think it stated who the father was, but its likely the son, Irek Ismaren, was Palpatine's. He trained in the Dark Side, his growth accelerated by the use of Imperial technology. He tapped into the power of the Force on Coruscant, unfortunately he was left with no memories or humanity.. only a deep instinct to claim the force powers. Luke and Mara, along with Tahiri, managed to kill him.