Request this in the mod section.
My specific suggestion would be to see if anyone can script an item that will display the items description above the wielder's head (there are scripts that do something similar when you interact with an item - i.e. the wheelbarrow "I'm not going to use THAT but I may be able to move it...")
I'm not a scripter so I dunno if an item worn or in inventory can do that or not (nor how to script it)
My thought process is the GM can have items in his inventory that he gives possessed characters and just needs to change their description to change the output over the head so you can get that illusion of speech or mood such as the OPs suggestion: "<eyes the players suspiciously>"
Seems *possible* but again I can't say if it will work or not since I don't have specific knowledge on the limitations of scripting in this engine.
I do think the idea is a valid and useful one though so best of luck