For what it's worth, I downloaded the sample, imported it into calibre, KindleUnpacked it to an epub, ran ModifyEpub and then used kepubify to convert it to a .kepub.epub file (I could have used the KoboTouchExtended driver to do the same conversion on the fly as I sent it to my ereader). Since you can KindleUnpack and ModifyEpub multiple files in one operation, this keeps the time and effort down.
I've attached an screenshot of the same page as in the OP's first post to this message.
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