"Is there any material on whether or not the IRGC is working with the Shia in Afghanistan, like the Shia elements of the Hazaras, or any of the other groups in Afghanistan?"
That's an excellent question. The Hazara are Mongol-descended Sevener Shia who would be "hereteical" in the eyes of more stringent Iranian Twelver Shia. OTOH, the ruling clique in Syria are Alawites, an even more distant and weird offshoot, yet are nominally considered Shia by Iranian authorities.

I suppose if the Iranians can work with Hekmatyar....