David Creelman and I have put together what we call a conversation covenant - an agreement between two or more persons to abide by a set of rules when engaging in conversation. The rules are intended to help people work in harmony to create a psychologically safer space for seemingly impossible conversations.
What's an impossible conversation? It's one that feels futile because it takes place between people who hold radically different ideas, beliefs, morals, politics, or worldviews. But see here for a fuller description.
Take a look, we hope you find it useful and can customise for your own use.