technically not possible. R mount "too large" for that. Even a "RF-S" 24/2.8 would be larger than the EF-M 22/2.0
It seems to me that it is will be quite possible to make R APS-C lenses close to the same size and weight as their M counterparts. Image circle is still APS-C not FF, so the same "M" interior lens design only needs a wider mount diameter. No one says the entire lens needs to be the same diameter as the mount. Many lenses are wider than the mount, so why not narrower? If the aesthetics aren't pleasing, they can just put in empty space. Sightly heavier due to the wider mount - everything else the same. Viola, an R APS-C lens close to the same weight and size as the M lens. Not a lens designer, so could be wrong...
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