Fxvector->cpointer?

Would it be possible for Racket to export something like fxvector->cpointer?

Racket has flvector->cpointer, which allows me to make my own my-shared-flector struct work also for flvector without losing any efficiency (and actually gaining some efficiency because I can now use memcpy), but there's currently no corresponding fxvector->cpointer.

Apparently there's an old PR for this.