Yes if you rename it as *.kepub.epub it will be treated as a kepub and italics will work for "broken" fonts like Kobo Nickel. You do not need to change any meta data in the epub, just rename it. I think there is a Calibre plug-in which does this too.
But kepubs are displayed with a title bar that takes up too much space, in my opinion, so I do not use kepubs.
I agree "optimal" is just a weazel word, rather than admit there is a bug.
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