I would not be shocked if they helped him in some ways. I would be surprised if they let him live within Iran's borders.
An accurate assessment - Gulbuddin Hekmatyar has strong ties to the Iranian Mullahs and they would provide indirect help for UBl through him - G. Hekmatyar is one of the top 3 HVTs we are after in the Stan/Pak border region (and he plays in Stan much more so then any of the rest).