My wing are fairly harsh when judging the worth of over 18 cadets. OC wing has made it very clear that cadets just coasting along are not worth the hassle.
In the past, if, for whatever reason, if I’ve struggled to find something that approximates what wing want, I’ve made sure those cadets qualify for the AFA, and then plan use them as first aid cover on events, exercises, squadron nights, etc (once they turn 18).
Whilst the concept of adding value is a bit sketchy, and open to some creative thinking, be aware that Pers 5.01 specifically states they must be a Leading cadet. If you think they struggle to pass due to attendance, why not open up your squadron on a weekend, and get them to sit all three exams?