I'm sure you don't want to hear this, but wouldn't the obvious and easy solution be to stop embedding / calling for fonts?
I see embedded fonts and images used as sorts all the time on books from mainstream publishers. They rarely or never add anything of value to the book, and often enough they cause problems. (On that Gemini freebie you mentioned, I see that changes in scene are indicated by three bullets in a row, provided by a small rectangular image. Of course the image shows as white on the beige background of my iPhone--which I use for reading before the opera begins, so I want it muted in appearance as well as in sound--which looks odd a bit ugly.)
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