I don't think the crew rest issue mentioned above has much to do with it.
I do think NVGs would help, I sure as hell am not comfortable flying without them at night to an unimproved LZ.
But if the presumption that inadvertent IMC is the real killer, I think flying dual pilot would probably be the most expediant "fix."
Why am I so inclined to buy that answer? Well everyone I fly with is fully instrument capable, the aircraft I fly is a very good IFR platform, and I still cringe at having to fly in the weather. I don't do it very often, and I imagine most helo drivers don't do it very often, even when rated to do so. I'm ok with having to do it, mainly because if I'm the pilot on the controls, I can focus on just flying, while the non-flying pilot does all the "thinking."