European IR
Surely the best solution is to have a suitable PPL EASA IR modelled on the FAA IR with a European ground school sylabus. I fly an N Reg. turbo-prop single here and around Europe. The owners 20yr old son with about 250hrs experience, completed the FAA IR training in 4 weeks. He now flys IFR quite safely all over Europe.
The exams being tailored to the job in hand . No Loran Consol and 'draw a gyro horizon instrument', interminable NDB holding and approaches. I have competed both the UK ALTP and FAA IR flight test and the FAA was by far the more useful test. Including GPS, I don't think the CAA has an Examiner yet qualified to test for GPS Approaches!
The huge percentage of US PPL's with an IR versus the 1-2% in UK tells the story.
It will never happen, but just authorise the FAA IR for use in any ICAO Country.