It would make Iran’s mullahs go nuts............
It happened at the very beginning of the modern story, around the time portrayed in “Lawrence of Arabia”. Search for “Harry St. John Philby advocated for Jewish Immigration into Palestine”, you come up with various articles about the fact that Ibn Saud favored it. https://apps.dtic.mil/sti/tr/pdf/ADA111290.pdf
Ibn Saud was portrayed in Lawrence of Arabia. It was the main strategic point, that upon the dissolution of the ancient Ottoman Empire, the power vacuum led to concerns about the then-obscure Saudis.
Harry St. John Philby was, in effect, Ibn Saud’s foreign minister. He converted to Islam, had multiple wives, bought a young girl at a slave market in Istanbul. He was the father of the Third Man, Kim Philby.
The question will always be how real it is. Something tells me Egypt will never turn back. The Camp David meetings in the 70’s was bigger than Begin and Sadat. History demanded it.
At this point the Saudis have their toes in the water. What could blow it is a US administration not paying attention due to distractions.