The problem is that the rules allow the autorotation characteristics to be subjective in accordance with the requirements of the regulations.
and without exceptional piloting skill or exceptionally favourable conditions
Who determines this? Who ticks the boxes for the Type Certificate?
There are SFAR's out there to cover this issue which must indicate that there is an exception!
Remember that Frank R. never designed this aircraft to be a "trainer".
The simple way to avoid this is don't do it. If the training syllabus requires you to do it - go and get a different type of aircraft.