CAAAD
There is nothing wrong with the cowling latches on the A320 and it has a good safety record, to the best of my knowlage no properly secured cowl has ever departed the aircraft.
So lets start looking for the underlying reasons for the failure to secure these cowls and not rush to mandate another expensive mechanical system to solve this problem.
Your solution to the problem will only secure A320 cowls, a look into the underlying problems will improve the whole maintenance system and is likely to also identify other issues that are not related to A320 cowls.