I’m not sure why I did not realize this before, but I’ve noticed another possible source for the Lead Codices script presented thusfar (including some of the odder features, such as the omega-shaped shin):
Take a look.
I’d also be curious if any of the iconography could be found on other Bar Kochba coins.
UPDATE Apr 26: According to Philip Davies’ editorial:
“The list of dramatis personae is not complete, either: Robert Feather, a metallurgist who has written on the Qumran Copper Scroll, and seems first to have broken the story, has been in contact with Mr Sa‘eeda and has himself a theory that in some places the Hebrew letters on the sheets appear to stand for Bar Kochba, leader of the second-century Judean revolt against the Romans, and for the Rabbi Shimon bar Yochai, who according to legend hid from the Romans in a cave for 13 years and also instituted the Kabbalah.”