Toward Ecosophy

The Greater Ritual already exists. Use the Supreme Ritual of the Pentagram in its summoning form, then use the invocation from the OIW ritual, then formulate the spheres nine times instead of three, then circulate the light, then do the closing bit of the OIW ritual ("Gwron, Plennydd, Alawn, all are one in the infinite Celi," with the gestures), and then close with the Supreme Ritual of the Pentagram in its banishing form. Start by practicing it once a week -- it can be pretty robust, and your subtle bodies will need time to get used to it -- and then work up to once a day.