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If it's just the matter of adding one bolder/bigger/whatever font (you can't have the inversion part aka Night Mode, white text on black background, without jailbreak and then using KOReader app) you can embed your custom font using Calibre, and to be able to send the book to Kindle Cloud archive you just change mobi output type from "old" to "both", send that file "dual" mobi file as you would plain old mobi. Your PW should then get azw3 file delivered that contains the embedded font, that is you have "Publisher font" option available.
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