J&M make a lower cord with a 3.5mm stereo jack in it. Works well but only if you have the J&M headset or something that uses a compatible upper cord.
I had a slightly used one for sale here listed a year + ago. I still have the cord, just haven't been pushing the sale.
This is my signature block. There are many like it, but this one is mine.
My signature block is my best friend. It is my life. I must master it as I must master my life....