Multibyte Text in OpenGL

I’m trying to display some Japanese text in OpenGL. I tried using wglUseFontBitmaps, but this function does not support multibyte text.
The other option I had for displaying text in OpenGL was textures. But the specific application that I am trying to modifiy uses Color Index mode and textures dont work in the Color Index mode
Does anyone know of a way to do this?

Yeah, stop using colour index mode.