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If it's not reflowable usefully anyway, and comics mostly are not, then a PDF with custom paper size and no margins is the most universal. The Kindle and epub3 Fixed layout are mostly only less compatible versions of PDFs anyway.
Unlike a cbz, a PDF can have a searchable text layer and and TOC, depending on how much effort you want to put in. No need to use Adobe or InDesign either, especially for personal use.
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