Hmm, considering it wouldn't be straying from the norm to have a nose in either reality, or the dream world, I would have to say this wouldn't be an entirely effective RC. Me looking at my nose in real life wouldn't be anything different from looking at it whilst dreaming. So, it really wouldn't arouse any suspicion as to weather i'm dreaming or not. Although, I do like the idea because it is very under the radar, which is kind of a problem with some RC's.

Maybe instead, try say.. 3 times or so at trying to make your nose disappear/change while looking at it? After the 3rd try in real life, you'd be most certain it was reality. However, firstly, we'd have to enter a lucid dream and attempt to see how easy it is to morph/vanish our noses.. new short little task? I think it could just be