I would not call that a choke but a faint caused by sudden pressure in carotid sinus baroreceptors.
Too risky is not the same than impossible. Anyway I would not recommend Feldenkrais approach if it resembles what can be seen in this clip
unless there are not other options available.
I'll try to get the book so I can get a more complete picture about his views on choking armed people in a combative environment.