Gosh where do i start. Firstly we have to recognise the PPC and a 3 axis are totally different in level of complexity and safety. There is absolutely no reason they should be operated under the same levels of regulations or even the same Op's manual. To continue to do so is just laziness or an unwillingness to recognise the differences.
RAA mandates 20hrs minimum to pilot certificate. Have a look at the Training manual for 3 axis and compare to the PPC syllabus and try and convince me they would take a similar time frame to complete. Most PPC pilots will be solo in 3-4 hours and suitably proficient for a PC in 10-12 hrs. The remaining time is often just flown off doing some circuit work or XC flights to make the 20. This is at a cost to the student of an instructor where is is not really needed. (A PPC cert from one large company will cost you $4000 if you buy new one of their PPC's, if you already have one it will cost $7000. If you own a different brand, they will not train you)
The hours needed before being able to apply for an instructor rating was increased to 100 in the last Op's update. That may be suitable for a 3 axis but 75 was more than enough for a PPC. An additional 75 hours under a CFI before being able to apply for SI is again excessive for such a simple, safe aircraft and additionally unachievable with only 7 CFI's in the country. We don't need to train for stalls, spins, unusual attitudes, training for engine outs is pretty much the same as any other landing. I could go on but the training and supervision an instructor might need could easily be accomplished in 20 hrs. (if the CFI's were there)
An instructor, SI or CFI rating/approval is currently transferable to other groups with minimal instruction. (thats how we got all our CFI's) but it doesn't have to be. By making the system more appropriate for PPC it would be easy to make a PPC rating/approval non transferable, easing all your worries about a PPC instructor getting a group A pilot certificate and starting to instruct on that type.
My basic point is that changing the rules to suit PPC operations does not mean it has to apply to all aircraft. Making the changes to the manuals as we have always done, by including all aircraft groups is just lazy and ill-informed.
Anyone with a sound knowledge of PPC operations could have a new draft Ops manual ready for 'presentation to the Board and member comment in a week. All without making changes to the operations of any other class of aircraft. All it takes it the will to do so.