There was a recent thread on the font topic. I was considering making a Cyrillic 8bit set because some people had the need for it. I haven't had the time though. I did complete the 8bit Latin set (the current b11 software has many of my character mods but is missing the last changes I made to complete the upper 128 set.

If you know how to use a bitmap editor (paint-type software) then you can make a font.

The two main fonts (for text display and menus) are the medium and small. The medium is 9 pixels tall (from bottom of descender to top of ascender) and the small is 6 pixels. On the medium, a capitals occupy the top 7 pixels and a lowercase "g" and "y" the bottom 7. On the small font, caps use the top 5 and lower case g and y, the bottom 5.

You can use two "colors" plus black/transparent. The primary colour is full brightness and the secondary is a very dim shade (used for antialiasing (smoothing) corners).

You might be able to get the font source files, but if you'd like, you can make a bitmap and I will make a font out of it. Just make sure you put them in the bitmap in order. Use a Greek 8bit set which includes the standard western lower 128 characters (you don't need to put those into your bitmap).