The idea that "stop the trolley" or "slay the dragon" is cost-free is a wish. You've merely added a third horn to the dilemma. "Someone brave attempts to jump onto the moving trolley, risking their own neck" might well be the preferred choice; the expected outcome may marginally improve; the shape of the problem remains.

I hope you're arguing out of perversity, not conviction - such is valuable, and i did have to think for a minute. I agree that lateral thinking can be productive.