Nick,
I think you already know that most corporate machines bought from Sikorsky are very well equiped with the aids to flight safety that you list. I am very grateful to Sikorsky for developing and providing them.
But, the issue here is power. Not just OEI but twin engine power.
Apart from the 'B model' the 76 just doesn't have enough power.
Eurocopter's 155 has similar limitations.
The topic of this thread was "full Cat A?" Yes, there is a market for it.
I'm just glad that another manufacturer is addressing that!