Seems to me that any solution that requires a built-in hardware phone dock is doomed to fail. Smartphone life cycles are just too short. By the time the dock and extender come out, the device it is based on will be halfway to obsolescence.
Really, I would look to a software solution that would run on an EEE-PC. Why reinvent the wheel on the hardware? Combine that with a flush-mount Bluetooth dongle, or add Bluetooth to the EEE-PC, and you are good to go.