I was messing around with *hax 2.5 today and noticed a thing. If you launch the system settings through HANS and set the region to whatever, e.g. Japan, you will not be able to use Miiverse or eShop (if you try launching them from the home menu, a message will popup saying your region settings don't match the NNID).
I was wondering, what if I call Nintendo and make them unlink my NNID (I can pretend I sold my console), then signup for a Japanese NNID? Shouldn't that enable me to use JPN eShop & Miiverse?