Thanks for clarifying - it’s an interesting line of argument worthy of additional investigation. I’m still going to go down a path of investigating my hypothesis as I think it’s possible that Isis was represented in multiple ways similar to Osiris having Sah as a representation as well as the sun, or Horus being represented in multiple ways.
In that line of thinking we could be looking for two Isis figures - the Isis assisting the birth and the consort of Reusre.
Heqet is connected to Hathor but I’m not clear whether that connection means they are the same entity or not. Hathor is in turn connected to the Pleiades (the 7 Hathor’s) and in discussion on p161 there is a linkage of Hathor to the Bulls Foreleg and the star Alkaid as well as on p181 where Hathor is said to have merged with Isis and with Sopdet named as Sirius...
I like your idea that the Pharoahs birthdates May be encoded- it is something that I had wondered but not yet articulated.