This would need a combination of reading the /proc entries that Hijack adds, and having some way of knowing what characters to display from the info there.

If you encoded the titles in Unicode or whatever (I don't know enough I18N stuff), you could pull it directly from /proc/empeg_notify, as it puts the title and such there. Only problem is that all searches, playlists, etc. wouldn't be in Chinese characters, but whatever encoding you have in the titles. Quite a big price to pay for Chinese display.