You propose:
> Insert a new paragraph below [expr.reinterpret.cast] p6
> A prvalue v of object pointer type "pointer to cv1 T1" pointing to an object a can be explicitly converted to an object pointer of a different type "pointer to cv2 T2", where cv2 is the same cv-qualification as, or greater cv-qualification than cv1, the result of which is defined as follows:
> — f T1 is a contiguous-layout type and T2 is unsigned char, char or std::byte, the result is a pointer to the first element of the object representation of a.

Is there much sense in specifying casts to `char` or `std::byte` as giving a pointer to the first element of the object representation?
You won't be able to use it for pointer arithmetic.