[NTG-context] utf-based lang-* files?

Salvete, while I am aware that my Japanese is ages away from creating anything releasable, I thought about creating a lang-jap.tex file for my personal use (and maybe for having it corrected by someone actually speaking the language). Now, checking lang-chi.tex, I find it is encoded in a way I don't really want to copy. I'd much rather write the whole file in “proper” utf-8. Is it possible to simply enclose the file in a \startregime[utf]...\stopregime pair or do I risk havoc by doing this? (Should I start with this project, I'll have more questions, such as: How do I make a unicode character such as 。active, for good line breaks?) Christopher