Okay, I got it working and actually wired up the event that can give it to you.
Unfortunately, I had to remove the chance that you would fail to unequip it, due to some jankiness buried in the inventory system that I can't even begin to untangle.
It does display the unequip message, though you'll only see it if you press the "c" hotkey to close the inventory menu. Back clears the message out.
I've alerted Leek to the issue - log events should not be displaying "underneath" the inventory menu, but that's a problem for the fuuutuuure!~