I think that installing a Shi’ite Mullah to rule Saudi Arabia (including Mecca and Medina), would enrage a lot of Sunnis - especially the tribes who live there.
I can’t see them accepting it, and would expect other Sunni countries, like Egypt or Pakistan to be drawn in.
Tongue in cheek. Were it Joe’s choice he’d probably follow Obama’s and GWB’s lead and advocate for the Muslim Brotherhood, Hamas in the case of GWB and palestinian elections. The Saudis will ignore him. And his Yemen policy.