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I think my suggested colours for the bikeshed would be handle_surrogates() and handle_surrogateescape(). “Rehandle” seems awkward and too assuming to me. And I agree with Serhiy that surrogates are a Unicode thing, not just related to the “surrogatepass” handler.

Adding them to “codecs” makes sense to me. The most important one, handle_surrogateescape() or equivalent, is closely related to the error handler of that module.

Having handle_surrogateescape or equivalent would probably be useful for Issue 25184 (displaying an arbitrary file path in a UTF-8 HTML file).