It is a fantastic mythological scenario, were you have the principle stellar Deity Sah of the early period, in conjunction with Sopdet, giving birth to Sopdu, then this co-joined with Re re-newing all, giving birth to Mercury/Horus as Morning star, and total assimilation with Hathor/Venus, elements of this i'm sure carried through into Near Eastern and later Hellenic traditions.
The Serabit site also being of particular relevence according to Petrie and others with regards to the formative religion of Israel. Certainly also as you noted regarding Avaris, the Israelites that dwelt in the land of Goshen were in the Domain of Sopdu...
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Morph