In case anyone is still interested in, the official HK eshop (web store only) opens today.
You can buy Super Robot Wars T digital version (supports Traditional Chinese, Korean and English) from the link below.
https://store.nintendo.com.hk/70010000015667
The official web store seems to be more stable and reliable than previous third-party solution. It is rather late, but at least Nintendo addresses the issue.
Does this accept non-HK credit cards?