Greenspinner...
The Dear Old Diesel Dixie (with CF6-50's) did indeed have pop-out indicators, but they were for the latch handle of the reverser cowl closing mechanism. They were both sides of all three... if the handle wasn't closed properly, or not rigged properly, it's end would hit the trigger for the spring-loaded pop-out (you'd see a red dowel sticking out of the fan cowl about 2 inches.).
The V2500 cowl issue could easily be fixed by a spring device that held the cowls open a bit until and unless they were latched closed. ....and I agree, since it almost requires getting on your knees to verify the latches are all closed, some simple pop-out device (popped if any latch not latched) is a great idea.
As has been said, It happens to them more often simply because they sit naturally fully closed (without being latched). The KISS principle ought to be considered in any response.