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Pyramidology did not come from Masonic belief but from two British writers. The one most influential on Russell was Charles Piazzi Smyth. Russell circulated for a brief while a pyramidology book by J. A. Seiss, an American Lutheran pastor. There is nothing in Russell's theology that parallels Masonic belief or practice.
I am a Bible Student; I am not affiliated with the JWs, but I have been studying the writings of Bible Students for more than 50 years, including that of Russell. I am hoping to make a few statements regarding some of the things posted.
Yes, Russell's study of God's Witness in Egypt has nothing at all to do with the Masons. In my discussions with some of the Masons, none of them I have conversed with has any knowledge of God's Witness in Egypt. Indeed, although there might be a some Masons who are Christians who may have taken some interest in the study of God's Witness in Egypt, it does not appear to something generally studied among the Masons. Furthermore, since not all Masons profess to be Christian, it could not be applied universally to the Masons. Nor have a found such an general interest in the study of God's Witness in Egypt among the Knight Templar, although, again, various individual members of Knights Templar may have some interest in such a study. If, however, a Mason were to take a serious interrest in Russell's study of God's Witness in Egypt, it would lead one to the conclusion that being a member of the Masons is actually vanity.
Most of what Russell presented about God's Witness in Egypt came from Nelson Barbour.
Russell never used the word "pyramidology", and as best as I can tell neither did Nelson Barbour. I believe Piazzi Smyth used that word once or twice. The word simply means "pyramid study" or "study of pyramids". As the word was originally used, it did not mean what it is often attributed to that word today: spiritism, pyramid power, etc. Russell did not believe in "pyramid power", spiritism, astrology, etc.
Much of my research related to Russell and the Freemasons may be found at:
http://rlctr.blogspot.com/2016/12/freemasons.html