The fundamental problem is that a training glider is not a military aircraft, it is a civilian aircraft and so trying to use a Military Airworthiness system to attain and maintain glider airworthiness is just using a huge hammer to try to smash the round peg into the square hole.
The Canadian AIr Cadet gliders and tow planes are all civilian registered and the Cadets get a Transport Canada civilian glider pilot license at the end of the course. A typical year will see about new 300 GPL’s issued,
The main RCAF involvement is providing the resources of the Air Force flight safety program and personnel to enhance safety
I would suggest that as long as the RAF keeps trying to run the UK Air Cadet program there will never be any significant Air Cadet gliding available for the Air Cadets of today or tomorrow.