I have found that the more I use my simulation of HPMOR!Quirrell for advice, the harder it is to shut him up. As with any mental discipline, thinking in particular modes wears thought-grooves into your brain's hardware, and before you know it you've performed an irreversible self-modification. Consequently, I would definitely recommend that anybody attempting to supplant their own personality (for lack of a better phrasing) with a model of some idealized reasoner try to make sure that the idealized reasoner shares your values as thoroughly as possible.