I would probably just do a more logical filenaming convention like:
Method A:
TableofContents.xhtml
Introduction.xhtml
Book1-Chap01.xhtml
Book1-Chap02.xhtml
[...]
Book5-Chap01.xhtml
Method B:
00-TableofContents.xhtml
01-Introduction.xhtml
02-Book1-Chap01.xhtml
03-Book1-Chap02.xhtml
[...]
99-Book5-Chap01.xhtml
This is also helpful if you uncompress the EPUB and use other tools on the files, then reimport elsewhere. Because the Method A/B filenames ALREADY sort in their proper order (or near proper order), you don't have to waste time manually reordering files in Calibre/Sigil.
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