It would be nice if you could create a webpage with a bit of JS with controls for choosing the font parameters, and the right font coming up on the browser window, perhaps with a nice zoom factor.
To turn this into a font for a sprite sheet would take some sort of mapping for each..
Autosegmentation seems maybe practical.
Are the glyphs in any order? I just poked around and it doesn't seem so. Indexing them according to character code would be a fair amount of work by hand. Maybe a handwriting Neural Net? Hmm.. I have an old one somewhere
The few I've opened appear to cover a 60-character segment of the ASCII table from 0x20 to 0x5B in row major order with a fixed glyph size indicated in the file name.
If you're going to show off demo scene bitmap fonts then the best way would be to use a scroller. Feel free to use mine... https://codepen.io/onion2k/pen/rYgxdJ