I don’t think you understand the shipping that takes place in the Caspian, where product can be intermixed with other product from non sanctioned countries.
That's nice, but it can't replace the 96-96% of oil that Iran exports via the 16 terminals at Kharg, a massive vulnerability. An attack there, coupled with targeted assassinations of Khamenei and his entire general staff, followed by MOAB strikes on the nuclear facilities, would silence them for a decade as we focus on fomenting a massive civil war.