Really, it's not fair expecting these 'Children' to be put in the position of a captain incapacitation without some awareness of what it might be like to get a real thrashing one 'dark and stormy'. They need at least an awareness.
Agree wholeheartedly. One way which is better than nothing is during type rating training in the simulator. Most simulators have various amounts of turbulence built into their fidelity. The Boeing 737 simulator we operate has quite alarming turbulence available which is very rarely used because no simulator syllabus calls for it.
Five minutes in the simulator of hand flying in a selection of moderate to severe turbulence is all that is needed for cadet pilots to learn the instrument flying skill needed to cope with severe turbulence. Motion sickness is likely so common sense and care needs to be applied by the instructor not to overdo it.