Yaretzki: in my books setting fonts as "default" made them not to be changeable (in epubs converted to AZW3s I was also unable to change font on Kindle PW2, so most probably it is intentional), but removing the "default" part in the font reference part of the css helped the issue, though it requires some epub editing, but this way you can keep original formatting, but can change the font. (Recently I had no such book, so I don't remember exactly.)
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