Not only do you need a programmed Key, the VIN in the PCM and SKIM have to match.
Whatever SKIM you find, you'll need the VIN off of it programmed into your PCM. You'll need the SKIM's VIN# to ask the dealer for 4 digit PIN number to allow the PCM to be flashed with the new SKIM's VIN. A DRB-III factory scan tool is used to flash a used PCM with the matching VIN.
With a PCM, SKIM, SKIM PIN #, a transponder Key and a DRB-III, you can have it all programmed in about 10 minutes.
It would be wonderful if Diablo could get the SKIM switches to work.