I have always been amazed by the general lack of understading of most pilots of the higher risk asociated with QNH missets on RNP approaches using baro-vnav. Industry has been flying this kinds of approaches for a long time and we have just went on happily accepting a very possible catastrophic outcome by a single error with no barrier or crosscheck.
Just to pitch an idea that floated on one of the previous threads, credit to
Uplinker who I guess was the first to pronounce it loud.
All IAP charts in their respective AIPs need to have the RA HEIGHT published at the 1000' HAT distance point. As an addition to the international standard, respected and observed by the NAA/ANSPs.
Very easy to do, unambiguous and proper solution to what is a narrow but very deep hole lurking there. No need for ADS-B-whatever or CPDLC/S. Pure, old, tested and reliable geometry.