There is a shorthand CSS property font which can also prevent the font-family being changed, but you can't always just remove all instances of font: without ruining the book because it is used to set other properties such as font-size and font-weight too.
If the stylsheet has something like font: italic 1.5em/1.2 serif; then you need to replace it with font-style: italic; font-size: 1.5em; line-height: 1.2; font-family: serif; (and then delete the font-family, line-height, etc. if you want.)
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