Does anyone know if there is a wired handsfree speakerphone kit for the 700w/p (as described below)?

the optimal kit would:

-Have simply a muticonnector plug (with a wire only)- mount agnostic- that leads to the control box (not a connector built into a mount)
-Provide power to the Treo
-Have a "control box" that can be hidden behind the dash
-Have external microphone plugin (to control box)
-have external speaker plugin (to control box)
-simply act as a speakerphone (all control is handled by the phone)

Anyone know if anything like this exists or how to accomplish this?