Quote Originally Posted by Fencepost View Post
You might be able to modify a standard light fixture by installing a pull chain switch in the canopy where it attaches to the junction box.

As for using a fan light, I don't believe there is any way to adapt it using off-the-shelf parts without some modification. Sure, you can modify another electrical box cover for the purpose, but that will nullify its UL listing, and some inspectors won't approve the use of modified parts. (The UL listing is only valid for an unmodified device used as the manufacturer intended.)
Point taken, but they make 4" round box covers with knockouts for conduit, so he could legally use one of those.