Jon, if you want an ePub2 compatible .ncx file, download the ePub version.
Since SE makes it rather clear that the kepubs are for Kobo ereaders and unless you import the kepub into calibre which it will lose the .kepub.epub for a single .epub file extension or otherwise rename it losing the .kepub.epub extension, simply copying the kepub to your Kobo will keep the .kepub.epub extension and render using the WebKit based renderer.
However since you appear to believe the WebKit based renderer does not offer anything tht the RMSDK renderer does not also offer, please try viewing Harry Potter: A Journey Through a History of Magic or any similar book making use of ePub3 enhancements using RMSDK and let us know how the experience was.
BTW, I'm not sure that I would refer to Standard Ebooks as a big publisher.
Last edited by DNSB; 05-09-2024 at 12:59 PM.
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