So a rather contravertial idea - how about petitioning the CAA to make FLARM (or a similar system) mandatory? Midairs would become a thing of the past, and it would greatly improve the image of GA in many eyes. At 500 pounds a shot (or much less when demand picks up) this would seem to be a very real solution to this massive problem.
As I understand the matter there is no generic FLARM. A regulatory authority should not approve FLARM for this reason alone.
It also cannot make sense to have two incompatible systems in use. Transponders are already so well established there is no possibility of FLARM becoming a widespread alternative.
I feel sure that eventually ADS-B or son of will eventually replace both.