The starting windspeed limits for many helicopters is about 45 kts maximum. Any more than this and the blades may well make contact with the airframe. This is on level ground, with the airflow coming from one direction, normally from ahead.
How fast is the airspeed of a plummeting and tumbling helicopter, falling from the rear of another aircraft travelling at about 150 kts or more, which is likely to be over the Vne of the helicopter with the blades under control at flying speed??
Totally ridiculous idea.