Gingernut
You are quite right - there is no test on earth that predicts who is going to drop down dead. The CAA is well aware that pilots still die at the controls and there is no way of eliminating this.
Statins certainly reduce sudden death as may aspirin.
However more and more regulators are grabbing at straws and moving towards stress ECGs and even angiograms. The problem is that you get false positive stress ECGs and then end up with an angiogram which has both a mortality and morbidity ie some completely normal pilots will be harmed
The real answer is a calcium score which if low effectively rules out coronary disease. CT and MRI angiography carry no mortality and give the same information and an angiogram.