Genghis, with all respect, you as an Instructor should know the difference between SEP and Microlight. Despite being a commercial pilot myself I think it is arrogant of commercial pilots to think that holding a CPL would automatically make them a better candidate than a CPL.
The LAA coaching scheme is about putting the most experienced pilots in the hot seat. That experience comes from having been out and actually done it extensively rather than just on bought ratings. To that end the system works really well. It is well structured and quality checked which is more than can be said for a lot of Instructors!!
I am sure when you meet the requirements, a man of your breadth of experience would make an excellent addition to the coaching team.