Crap visibility just means they are not going to take you into the alpine. You'll be riding at tree line and below. Where visibility should not be a problem. Without trees, heli's can't tell where the ground is, which can be a bad thing if you are in one.
The cat operators out of Selkirks are legendary. Both Mustang and K3 are well known. The terrain they access is as good as any heli. You might want to reconsider.