Brent,
Contact some of the radio sellers - Universal i believe might be able 
to help.  The Wireman comes to mind - principally he would deal in 
coax and its connectors but perhaps could be of help.  And perhaps 
people you contact could make suggestions.  i am not sure that the 
iPhone plug is proprietary - if not it should be available and the 
other pieces are very much out there.
Hope this helps.
pat, K9JAuAt 07:16 PM 8/20/2015, you wrote:
>I am an amateur radio operator, and I know there are a lot of things out =
>there that one may need to build in order to get. Cables are often a =
>good example, and they could be very difficult to do if you can't see. =
>Where might I find someone that can modify or build a headset mic combo =
>that has the iPhone-style plug on one side and a regular headset plug on =
>the other to have computer in one ear and the phone in the other and =
>have the mic working to be able to use it for calls? During my research, =
>I found that Plantronics makes something very similar, but the phone =
>side only works with specific office phones and their odd connectors. I =
>prefer the on the ear headsets like the cheaper computer headsets used =
>to be as opposed to full cans or buds that don't fit me well. As a =
>result, I tried to use two pair once and busted at least one in half by =
>pushing one side off my ear to put that side's earphone on my ear from =
>the other pair. Are there places out there that might be able to make =
>something up? I had gotten hold of this one guy on a site called =
>Thumbtack that isn't designed for getting quotes for this, and he said =
>he could make a little cable to do that where I could plug any headset =
>mic in, but now that I told him which one I had in mind, he has seemed =
>not to respond any more.