My 2005 S/C RRS has cruise control and AAC but no button on the dash for forward alert control.

Is the wiring loom all in place, ready for the switch to be installed by replacing the front surround with the correct switch combination, or is that completely out of the question ?

Pressing the ACC distance control on the steering wheel when cruise control is off shows something like "forward alert turned off" on the dash. 

"Roads ? Where we're going there are no roads." Back to the future.