(a) I agree, we probably have to do refine the tetrapharmcos and cannot only copy concepts from the past. On the other hand, I believe the tetrapharmacos still to be a good fundament, but it needs additional explanations. For modern readers it might sound too inconcrete and it has a strong "healing" attitude (which I personally like while others may not). This might be also the advantage and disadvantage in comparison to the four principal statements formulated by you. They emphasize on presenting facts but include no further solutions.
(b) Have you ever contacted the Hellenic Gardens or the Sydney Group for further materials or interviewed on their experiences?
(c) I'm generally interested in philosophies/religions/movements, for this reason I read the "Big Book" of the Alcoholics Anonymous some years ago. The introductory words sound quite inspirative. By exchanging some words it could use as an inspiration for our own writing - though with an immense emphasis on healing.