Just to add my two cents,

I'm no lucid god but as of yet, the nose-plugging RC has 100% efficacy. I think it has to do with the fact that you're consciously breathing in, thus making your lungs breathe in in real life? Even though your dream nose is plugged, your body can't deny the fact that your lungs are physically intaking air. I could be wrong but this makes a lot of sense--and it makes me believe it'll work