Thank you guys.
I’m creating an EPUB from a scan of a book by Günther Anders. I’m planning to send this EPUB as a sample to publishing houses since I’d really love to work in the industry, so I’m pulling out all the stops on the quality.
I think I’ll export the page numbers from ABBYY FineReader OCR as plain text instead. That way, I can use regex in Sigil to modify the <p>page_number</p> tags exactly how I want.