Hi! Thank you for your message! :)
1) That may be doable, can you tell me more about your tilemap specs? At the moment my fonts are actually drawn as a tilemap in Aseprite then exported to TTF with Pixel Font Converter.
2) As much as I would love to expand with other scripts, it is very hard when one is not familiar with them. I learned some Japanese and Hiragana 20 years ago but forgot everything, I'm afraid that won't get me far :)
Your best bet is to find a matching font. On this Japanese pixel fonts page I think the one named M+ BITMAP FONTS might fit your needs? Or by the look of it, maybe LanaPixel even if it says 11px?