My take on this (we have a bit similar situation) is that you pitch one long-term vision that you believe in. In your case, it sounds it is the platform, and th

My take on this (we have a bit similar situation) is that you pitch one long-term vision that you believe in. In your case, it sounds it is the platform, and the first product is a step that takes you towards that vision. When you are unsure about your long term vision (which it sounds that you are) you can also learn a lot for your thinking by pitching different versions to different people.