Let's go crazy and think this through.
What happens if the standard is set to e.g. current IFR rating as a minimum, and there's an accident? The response must be: Set the standard to e.g. current IFR rating and CPL as a minimum.
Why not do the logical thing and just set the standard where it must inevitably be set? ATPL/RPT/CATIII ILS operations only.
On what ground would the standard be set other than the highest possible standard?