It helps to analyze the Hexagram formula as it’s given, to understand what’s going on in it.
The Hexagram ritual is made up of 4 parts:
1 - Analysis of the Keyword, which is a dynamic meditation known as Flow Yoga or Qigong. This grounds you while putting you in a focused trance to prepare you for the ritual.
2 - The Formulation Of The Hexagrams banishes or invokes the planetary energies you want, as well as the element of the planet you want to banish or invoke. Just like with the Pentagram ritual, there are permutations of this and they can give many variations of the Hexagram ritual.
3 - Your Spirit Communication (conjurations, requests, and release), which isn’t explicitly mentioned in the Hexagram rituals, but it’s there. For banishing or evoking, you make your commands or requests. For invoking or possession, this is where the spirit speaks through you and you notate it somehow.
4 - The Closing Analysis of the Keyword, again a form of Flow Yoga with breathwork to ground you when the spirit departs.
With this understanding, you can either look for different Hexagram rituals, or create your own using your own personal correspondences, if you want.
As you already know, the standard Hexagram rituals are the Lesser and Greater Hexa rituals. The Star Sapphire is a form of the Greater Hexagram ritual in Thelema. These are explained here. There’s the Enochian MADRIAX, which adds power to the standard RH. The Assumption Of The Godform may or may not be a variation of the GIRH, i leave that for you to decide. The Godform instructions aren’t given online, but examples of automatic writing transmissions in Godform include Al vel Legis, Israfel , and 49.
I’ll keep an eye out for other Hexa rituals and chime in if i find any.