Answering my own question, just forget the template and handle it yourself using this tool:
InDesign Book (not Document) to Blurb
I have an InDesign Book (a regular InDesign book, which is a series of InDesign Documents, separated by sections and chapters). The Blurb plugin doesn't seem able to handle a book. Only one single, very long document. How do I properly create a cover if the Blurb plugin can't load the "Book"?
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