Grace - it sounds like Kaiser offers a nice opportunity for you to make some changes, particularly if implementation of the program works because they tend to be very good adopters of systems changes that improve outcomes.
I wonder if it would help you to think about what they have at stake and what they care about in order to target your messaging to them. Instead of putting it in terms of why you think this would be good, try to message it in terms of what outcomes they care about and how your program will change those outcomes.