Sharing airspace with helicopters requires special care and vigilance.
Is it not the case that if a helicopter suffers engine failure, there is an optimum height for autorotation? I understood this to be c. 700 feet.....
That makes it difficult to ask the helis to cruise at 500 feet to maintain any separation from fixed wing, below 1,000 or whatever the corridor maximum may be.
Could the answer possibly be to INCREASE the Maximum ceiling for the Hudson River corridor - I bet the Jet traffic doesn't really use very much below 4,000 feet or so. Then ask the fix wing to keep to the right between
1,000 and 2,500 feet, and the helis to remain below that.
But I don't know much about it except from dodging heli's in my glider . . . .
there's always one or two every day flying over our winch site! (cables up to 2,000'.)