There are many things I can do on the fly with KOreader when I am reading a book. But I don't have a clue about this: I am reading a book where a special font type is used for letters. I would like to keep it for knowing that I am reading a letter, but I want to overwrite all other fonts with my custom font choice. Do you have any idea how to do it without trying to edit the book outside KOreader? The most comfortable solution would be a font list in which I could tick the ones I want to keep. Not only a single option to disregard all embedded fonts, as it is now.
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