This is totally not answering your question at all, but in my case when I needed Japanese support I had to use third-party software. I originally used CE-Star, which is not free, and now I use something else I don't remember the name of, which is free (and allows use of the hardware keyboard to enter japanese as well, whereas CE-star was only screen keyboard based.)
I think an easier solution for you would to be to look for a similar .cab, but for korean instead.
EDIT:
I got this from a google search.
I have not tried this method, nor do I know anything about it. Yes it's for the touch pro 1 on 6.1, but it will have the same results on the TP2 i'd imagine. However, I just realized you said for 6.5, so I don't know at all if this will help you after all, sorry.
http://leeblood.com/?p=620
I also know nothing about registry editing, so I can't help you at all in that way.