FWIW, pretty much everyone has an asymmetric nose, one nostril is larger. First-aid courses that cover nasal intubation always direct you to identify and use the larger nostril.
With respect he original question, I suppose if the difference is highly noticeable, then minor plastic surgery could be a solution. I know of someone who lost part of his nose in a (drunken) fight
. The surgeons repair job is invisible.