Why not try the system at just one high risk airport that has good radar coverage to low levels - say Proserpine.
If we introduced the proven overseas system where the pilot had to report when visual and until that time the LSA alarm was enabled at Proserpine it would clearly not require extra controllers.
If the controller missed the call the alarm would go off and the controller would ask the pilot if the aircraft was visual- if not climb immedietly!
Not rocket science but you do have to have an open mind.