You think people can be safely taught to fly instrument approaches to IR minima in a 15hr IMCr course
You still don't seem to have grasped the point that IMCR holders neither expect to fly to 'IR minima', nor wish to. The training for the IMCR to fly to IMCR minima is entirely proportionate, as 40 years of practical experience has conclusively proved.
I held IRs on various aircraft for about 30 years. Rarely did I ever need to fly to 'IR minima' - on most occasions the IMCR would have been sufficient.