I don't think it will work.....I am not sure though. The plug in you are referring to does two things...it connects a mic and headset speakers. But I have not tried what you are asking so I really do not know. I myself would not want a hand held mic. I try to keep my hands on the handle bars as much as possible.....LOL.
i have seen some older hand held mic's on bikes made by j & m but i don't see them on their website and bleave they've been discontinued. i though about getting one last year about this time but went ahead and got a headset