I wouldn't call it a mental model, but Voice Dialogue method has tremendous positive impact on people's well-being and consciousness. Somehow it fits your quest

I wouldn't call it a mental model, but Voice Dialogue method has tremendous positive impact on people's well-being and consciousness. Somehow it fits your question, I think. It is a mental model of sorts. "Embracing Our Selves", a book by Sidra and Hal Stone, is a beautifully written introduction.