What I've done instead of modifying fonts was to find a bold font I like for my crappy eyesight. I rename the bold font file to the regular font name, I do the same for the italic file. Easy and quick way to get thicker fonts.
I don't care about missing bold letters in novels, bold is hardly ever used in what I read. As long as italics work I'm happy. But if you do still want to see the difference between actual bold letters and the regular font, find a similar font style that's a bit thicker than what you picked out for your regular font and rename that to the font family bold and bold italic.
I've always done this on my Sony 350 readers and on the Kobo Glo, works perfectly and takes just a few minutes instead of getting into modifying fonts.
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