Our new book makes reference to a supporting document called "How Can We Make Conversations More Prosocial?", which you can view here.
We've recently launched The Prosocial Path, a digital tool which helps facilitators guide groups through the Prosocial process. It's free to use for now, as it still in beta phase. Feel free to give it a go and let us know if you have any feedback for how it could work better for you and your group.