I could find very little information about Asian-released NES games, but the boxes and cartridges do say "Asian Version." this would indicate to me that it's meant for the general Asian market, and not strictly for Hong Kong. Hong Kong may be the distribution point like you mentioned. In addition, the back of the Kung Fu cart and the manual for Hogan's Alley have both English and Chinese on it.
The question is, is that enough information to make these games actually general Asian releases, and not for only Hong Kong? Here's what I'm thinking:
Either way, since the TLD code sheet we have currently merges HK into AS, then the category should be renamed Nintendo Entertainment System [AS]. If somehow, we were able to find separate releases for only Hong Kong in specific, those games would have [HK] within the AS category.
If I find more information I will update what I think. Mastafafik, you have these games in your collection, do you have any insight into this?
Here are the two games in that category
Kung Fu:
http://vgcollect.com/item/63261Hogan's Alley:
http://vgcollect.com/item/90468