Anyone hired an open water coach?

I'm wondering if anyone has ever hired a coach specifically for open water, and if so, how you went about doing it. I have two great Masters coaches, but neither of them have open water experience. I think that I could benefit from someone who could help me develop a training program, incorporating my masters training, for specific distances and races. Right now, it's mostly a matter of me doing overdistance training, getting nervous about not having done enough, and then ending up doing fine and wondering what I was so nervous about. Based on having had a triathlon coach for several years, when I was doing that intensively, I think there might be just a little more science to it than that. I'd love recommendations. Thanks! Sydne