Would the adapter they've got here help you? No idea what the dimensions on that thing are, but might be worth a shot.
I bought one through EPM, but it's really not a part of the aesthetic I want (for most of my ideas).
I'm working on a jig that will allow me to turn a tennon on the end of the churchwarden. It'll probably have to be a custom fit for a particular atty or clearo, if it works at all. I bought a couple of the rough stems for experimental purposes, so we'll see what happens.