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As a preparation for this post, I researched the AZW3/title_sort situation as best as I could: I processed my whole EPUB collection with the 5 methods mentioned in my first message and analyzed the resulting AZW3 metadata fields.
In the cases where OPF contains <meta name="calibre:title_sort" content="???"/>, using ebook-convert (Linux command-line tool), the resulting AZW3 book contains a title_sort field in less than half the cases.
(When using the --read-metadata-from-opf option, this field is never read/generated.)
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