#which you know tracks with actual pyramids being tombs constructed and decorated to help the dead cross over to the afterlife

[non-cannon]

The Touchstone of Ra is stupid. Like mythologically so.

Like why would Ra's special stone be capstone for a pyramid. Pyramids were Old and Middle Kingdom tombs. Generally the realm of Osiris and Anubis and other gods related to the underworld.* I think the writers just went like "Ra and pyramids, those were big in Ancient Egypt, right?"

*not to say Ra and his nightly journeys weren't connected to the souls' journey through the underworld, but I still wouldn't connect a pyramid with Ra.

You know what they could have done instead? You know what other tall pointy things Ancient Egypt had a shit ton of that were also capped with a special piece and were actually related to Ra and his light?

Obelisks.

Obelisks had their points topped with special electrum* covers which could be the capstone/touchstone. Obelisks are generally thought to be representative of Ra's rays. Obelisks were also big and pointy and very Egyptian.

*apparently electrum is an ancient mixture of gold and silver and isn't just that weird D&D currency that no one uses

The gold for statues thing still makes no sense, but a Obelisk would still be better than a Pyramid.