Thanks for the clarification Bose. Given that level of experience I could foresee PPLs with those hours making a very useful contribution.
I do see a few potential problems. Firstly as we know the vast majority of private flyers drop out of the scene fairly quickly, finding these experienced PPLs who ALSO wish to teach might be difficult. I can't imagine there are going to be enough to fill 10% of the positions available.
Secondly the background knowledge needed to adequately teach the long and short briefings. This may be achieved by increasing the ground school hours form the existing 125? To a figure that ensures sufficient knowledge. I'm not suggesting for a minute the full 650 hours needed for the ATPLs!