Where did you end up getting your adapter at? I bought mine through ebay. I contacted the seller and they told me that it won't work because I am not using a Kenwood mic, I have a Pryme mic. Pryme sells an adapter but it is 40 dollars.
You are saying you are using a 2-pin mic from Pryme and they don't think it will work since it isn't a 2-pin Kenwood mic?
It doesn't seem like it should matter much what mic you are using. I suppose there could be some impedance difference between the mics.
I tried at least 3 different adapters.
I know that I got one from GadgetInfinity. It was probably from them through an eBay auction.
I got one from radiogearpro on eBay.
I got some adapters direct from voxducer.com.
I think that I never did pay the full price and get a REAL Kenwood adapter. I don't know if that would matter or not.
My criteria (and difficulties) were a little different than yours.
I wanted the radio to work normally with the adapter screwed onto the side of the radio even if I didn't have a 2-pin mic set plugged in.
I never did get that to work.
The combinations of adapters and different headsets that I got all seemed to work fine when I did have the 2-pin mic set plugged in.
All of the different adapters that I got seemed to all work the same way but none of them worked like I wanted them to.