RF x(1/1.6) extension tube ?

RF x(1/1.6) extension tube ? https://preview.redd.it/r36p89fptn2e1.png?width=794&format=png&auto=webp&s=74e1b5f18d10a83054f12ed9ce4d5ec1102253e5 Why does this piece of lens don't exists ? Is it impossible to manufacture ? Not worth it ? To expensive ? It would be nice for people who would like to get FF lenses displaying their full FOV on APS-C senors.
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