Given that the exact same proportionalism and arm positions are employed in the iconography of the raised Djed, were Thoth is not present

Yes as a matter of fact there's the "neb" symbol again.

,you would conclude i presume that the entire point of the Egyptian mysteries was to create a trite optical illusion capable of only being seen by the desperate.

No the entire point of the Egyptian mysteries was to incorporate symbols in a variety of different ways. Negative space was just one of them.

On the other hand just what are you suggesting? That you draw lines and connect the dots and come up with what? Nothing much that I can see.