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There's a calibre plugin called Generate Cover; I've never used it on a book that has a titlepage.xhtml or cover.xhtml. I use it on books I've entirely redone that came from Project Gutenberg, Faded Page, etc. It uses the book title and author from the book's metadata, what's in the content.opf file in an epub, which is easy to set up/edit with Sigil's metadata editor.
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