Just out of curiosity, how many cases of pilot incapacitation have there been in, say, the last 5 years which have led to pax fatalities/injuries in GA aircraft?
Negligible.
There have been accidents, usually with no passengers present, where pilot incapacitation (a heart attack) has been suspected once other explanations have been eliminated. But it's totally just conjecture.
In the USA, where they have a vastly bigger pilot population, much of it flying under a medical which has no ECG, the data shows the risk is negligible.