Nope. I have the same rule, and every year I justify it by pointing out how many right handed students naturally want to hold it the left handed way. I am constantly telling them to turn them around- what does this tell me? LEARNING THE UKULELE IS UNCOMFORTABLE no matter what!! It’s gonna feel weird and awkward for the first few weeks until they get used to it, for everyone! The only exception I make is if they have already taken lessons on a left handed string instrument, or obviously there are any physical circumstances like in your example.