unifont has cjk support, bitmap fonts work just fine for the integer domain. been using unifont system and app wide for some integer number of years now. i believe the only app that i use that does not have unifont is the game rimworld, but i haven't investigated to see if there's any fix for that. for qt based apps i believe you have to use the environmental variable QT_FONT_DPI=128 or something similar, where the 128 is double the DPI, which may be some bug that i got around that may be fixed now