This makes me wonder if you could refer to fonts in the /fonts directory on the Kobo as
Thank you for proposing this. I have tried it already and it did not work. I wonder whether I might be better using "src: local(theFontName)" instaed of "src: url(FontFileNameIncludingPath)" since in the case of originally built-in fonts it would be even more difficult to figure out how to reference them by their file location. However, I did not get the hoped for result.