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What are you really intending to do?
If you are planning to sell the book through the Kobo shop, then you supply an epub to them and they do the work of producing a kepub. That will then be downloaded to the Kobo ereader/app of anyone who buys it. And the epub will be available for direct download.
If the idea is to supply a kepub formatted book in someone elses shop, it is a bit different. You need to add the spans for the reading position and cover property for it to work properly as a kepub on a Kobo ereader. And you need to make sure it is loaded to the Kobo ereader with the correct name. The hassle here is making sure that the ".kepub.epub" extension doesn't get lost.
The last thing you can do is the same as above but just stick with the extension epub and give some instructions for sideloading to a Kobo ereader. This means that other users will have the extra spans, but that is only an issue for the if they edit the book. The cover-image property will also be there, but I am willing to bet that no ereader application or device cares about this. If the epub validators complain, it should only be a warning or info, not an error.
The latter two have the problem that PeterT raises; Kobo do not fully support sideloading kepubs except as a test for publishers.
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