Having a complicated size 47 myself I do not even try to look for shoes in Kunming. I have to stock up in Europe and even there it is hard enough (And often made in China).
But one tip that will not help you for your wedding but others living or travelling around these parts of the world.
HANOI. In the center of Hanoi at the back of the "Water puppet teatre" there is a shoe market and some of the shops there sell shoes in large sizes (Mind you not to much choice either but better than Kunming)