[Avitas]

The author's point directly conflicts with your suggestion of using U+0027. The author correctly states that the apostrophe when used inside a contracted English word should be treated as a modifier letter. There is a Unicode apostrophe character set aside and labelled as exactly this--U+02BC.

The author's point makes sense to me. I agree and my initial thought is that the correct thing to do is recommend U+02BC be the apostrophe.

This is something for the future. It won't be faithfully reflected in text for years or decades.