Greetings!
As Imperial Arts had pointed out the original version didn't use the Egyptian godforms. Try the new Skinner book on the Enochian system. I've found it to be quite good! You may also Google around to find the original Sloane manuscripts to work from. Much to the disgust of some practioners here, I also like the Schuellers series of books. (IMG:
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The pyramid use stems from the GD (and others). They found it convenient to adapt the Egyptian form to the kerubic squares. I'm not certain that the Aurum Solis people have done that as well. I'm a purist, prefering to deal directly with the squares. The Tablet of Union has made up the 'spiritual' aspect of the system. By adding the Christ force to the squares themselves will totally unbalance the forces involved. Redundancy on my part won't help. Do as you will, you will find out.