Yes, you can do a couple of things:
- use only the characters you need. In the Online font converter instead of specifying the “Range” you can add the “Symbols” you need one by one
- lower the bpp. The built-in fonts has bpp=4, but bpp=2 should work in some cases too.
- enable font compression in the converter
- use
tiny_ttf
to render the character form a ttf file in run time