I have done both, Fuji, and I don't think the IR has taught me anything of practical use - except perhaps the lost comms procedure.
European IFR flight is a point to point RNAV exercise where you spend much of your time flying the filed route, with frequent DCTs to (sometimes very) distant waypoints kindly assigned by ATC, with occassional vectors in busy airspace. A SID to depart, a STAR to approach on and an IAP to land on. Anybody who has been actually taught the whole IMCR syllabus, and has approached the subject with personal interest, diligence, and a bit of a brain, can do this stuff.
It will be hard to do in a Cessna 150 with no autopilot and crap instruments, but would one want to do it in something like that? The Eurocontrol routes only start c. FL070, get halfway sensible filed for FL100, and get good filed for FL140.
So the issue is self regulating. The wreckage doesn't find its way into this airspace, in the first place. Yet the IR training is still geared up for people who really want to fly wreckage, IFR. I don't think many do.