I'll repeat my earlier point. What is ATC supposed to do with someone who reaches the IAF (or FAF) expecting to be VMC who isn't? Presumably push them into the Missed Approach? That means that most traffic will be descending to 200' to a successful landing and a few will be clogging the system by flying from the FAF to MAP, at 2,500' then starting a missed approach already 2,300' too high...it's horrible to contemplate.
If you dump them out of airways just far enough from the zone boundary to descend outside controlled airspace such that they can call visual for a visual approach it makes much more sense.
If they reach MSA while still in IMC they then have to assess their options, just like someone going to a VFR field today does. They might decide to push it, because they are certain of their position, or they might fly out to sea to descend, or they might declare an emergency and get shepherded down an approach.
These are all things we do at the moment and require no new regulation, familiarisation or training for ATCOs.
You know it makes sense!