Long time lurker, first time poster.
While your theory is indeed interesting, it is in fact outdated along with all alternative theories concerning the Great Pyramid. The discovery of the Merer Diary in 2013 has completely vindicated Colonel Howard Vyse, and has conclusively linked the Great Pyramid with the pharaoh Khufu of the Fourth Dynasty. Not only does this document prove the monumental structure was built for and under the orders of Khufu, it also reveals that it was the Egyptians themselves, and not aliens, Atlanteans, etc...,that built this massive stone sephleucre.
Furthermore, any suggestion that the Great Pyramid was intended as anything other than the royal tomb of King Khufu can be easily debunked by observing the centuries long evolution of Egyptian royal mortuary architecture, as well as the presence of a granite sarcophagus in the appropriately named "King's Chamber."