line splitter compatible with Fluke 80i-110s current clamp?

[mightyohm]

The common Fluke current clamp has a fairly small diameter opening in the clamp.  (About 1/2" dia.)
It's too small to fit the commonly available line splitters (Wavetek ELS2). This seems like an oversight by Fluke.
Does anyone know of a line splitter with an unusually small cross section that fits inside the Fluke 80i-100s current clamp?

Edit: Looks like the newer Micsig current clamps have the same issue.  The CP2100B has a 13mm opening, same as the Fluke.