...if flying a flexwing and you need to ditch...what's the recommended procedure for making an escape...if there is one that is....stay with the a/c till it hits the water....or jump from say 20-30ft,
Try jumping clear of a parked flexwing and you will get an unequivocal answer to that question.
Sound very hazardous trying to get out from one underwater with all those rigging wires.
Considering that the two who died in the Channel got clear of their flexwings, it is obviously not impossible.