And Umbra you can get even without starting the quest. Just go to the ruins and kill the girl.
If you do this without doing the quest, the Umbra sword will be totally weightless.
If you had already done the Dorien glitch, there is always the on at the end of the Vampire qure quest, once you have completed it, found all of the items, killed who ever and gt the potion, go back to the count and claim the reward, you can keep selecting it t keep getting gold out of him.