i would rather fly over the straight in anything rather than over some tiger country in the alps regions. very ugly terrain in there, and good chance you would never be found.
and statistically, water ditchings are quite survivable. only the temp of the water would dictate survivability.
and after crossing the straights recently, it isnt that daunting, longest leg is 50nm over water, and from 3500ft, there is land in sight at all times.
if i was doing it in a drifter os thruster, i would probably consider an immersion suit in winter..
actually, navy pilots wear similar stuff when water temps drop below 16degC.