It looks like the Aztec calendar has come up before: Dispatches from the front (Pre-Release Report) Aztec Edition
I tried it myself!
Two passes, map power engrave. Original file is a vector, but has superimposed white paths over black so unsuitable for direct use. Needs to be “flattened.” I started running combine paths over everything but gave up when it showed no intention of finishing, converted to bitmap instead.
