Compliments of the season,
When I lived in Hong Kong in 2005, there was (at least) one (modern) Xinjiang restaurant, found in Causeway Bay. You could get pumpkin dumplings, minced lamb and peppers to stuff into sesame bread pockets and if you drink, black beer. I dug it, but the place has been closed for a few years now...or did they move? Does anyone know where Xinjiang cuisine can be enjoyed in HK?
As for food from Guizhou, I like its spicy/sour qualities, but that may not be as widely welcomed/known in HK as other mainland regional eats. Do Guizhou restaurants exist here?