If you can change the subject of the post maybe you can get better information? Try something like "Is it possaible to add radio switches to my steering wheel" maybe?
It seems that there is a connection from the steering wheel to the radio so the next question is if you add the switches is the connection right there or is it further down the column? I have no idea.
here is the service manaul info on removing the switches..... The fact that you have to remove the airbag would be enough to scare me off 
REMOVAL
NOTE: A battery reconnect procedure must be performedanytime the battery has been disconnected.(Refer to 8 - ELECTRICAL/BATTERYSYSTEM STANDARD PROCEDURE).
1. Disconnect and isolate the battery negative cable.
2. Remove the driver airbag (Refer to 8 - ELECTRICAL/ RESTRAINTS/DRIVER AIRBAG - REMOVAL).
3. Using a trim stick, gently pry switch from steering
wheel at locations shown.
4. Disconnect electrical connector.
5. Remove switch from steering wheel.
INSTALLATION
NOTE: A battery reconnect procedure must be performed anytime the battery has been disconnected. (Refer to 8 - ELECTRICAL/BATTERY SYSTEM STANDARD PROCEDURE).
1. Connect electrical harness connector to switch.
2. Position switch and press into place.
3. Install the driver airbag (Refer to 8 - ELECTRICAL/ RESTRAINTS/DRIVER AIRBAG - INSTALLATION).
4. Connect battery negative cable.
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