Surely we are in the realm of wishful thinking here. If an aircraft calls up on the radio to ATC it is to request a service. From what witnesses say, the call was not even a Mayday. The instability of the aircraft is a feature that is peculiar to unstabilised helicopters, which are probably (guessing) just a few percent of the traffic any ATC works. Lets be realistic.
I recall a previous thread went on and on about this, but the solution to this is to avoid going IMC in such aircraft. In my book, this is ALWAYS possible (with the right mindset and training) except perhaps at night. We don't provide the right training at present, sadly.