Actually my Access-Aid plugin handles that, as well as filling in title tags in head, and making it easy to fill in image alt attributes.
So we have that covered.
I am now leaning towards not using a single character for the backlink and not using an aria-label and instead using Return to in the text as that explains what is going on and is unique.
I am going to push that change to master and then try both epubcheck and your Ace accessibility checker on it.
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