I have insurance with both life and disability cover that covers me flying in helicopters.
I got it through a local broker who is also a FW pilot and so has an interest and knowledge in the field. Initially I had to get seperate cover and if I recall was through an off-shore market (London I think) but after a couple of years he approached the company I had my "normal" insurances with and they extended it to cover my flying as well. After a year they dropped the exclusions and the extra premium that went with it.
So now I have the insurances without the extra cost.
I can give you his name/website etc if you PM me.
Cheers