One very interesting company right now disrupting the insurance industry is Zenefits. They employ a small army of insurance brokers and if you haven't researched them, it's def worth a few minutes of your time. You'll appreciate their business model.
As for selling to insurance companies, I have a good friend (David Bodansky) who owns a boutique insurance brokerage and I've spent quite a bit of time in his office. I'm sure he and his staff would be open to the idea of helping sell a product they believed in, so perhaps your angle is to leverage the existing relationships that every insurance broker already developed?
I think it's safe to say all insurance brokers have relationships and memberships to AM Best, hopefully that helps...