Just for a small note...
The 14 parts of Osiris may represent the 14 hours of night on the winter solstice.
Then there is the southern shaft of the upper chamber of Khufu's pyramid that Petrie states as having the sun shine down it twice per year at noon...some 267 (?) days apart...the length of time for a child to go from conception/last day of menstruation to birth.
This kind of stuff goes toward the pyramid being for Ra, Osiris, Pharaoh, and the 'resurrection' of the sun/son, possibly also giving us some info on Khufu's own birthday, if we can identify what that date actually was.
I got half way through your post and will read the rest later, but didn't Khufu also state that he built his 'temple' next to the Temple of Isis? (Other's may have already stated such things but I haven't read the posts...sorry)