When my remote key-head died, I bought a valet key head and swapped the chip from the remote head to the valet key head. I also swapped the metal key from the remote head to the valet head. Now I have a spare key I can keep in my wallet, instead of a spare key with a big dead remote on it.
This thread discusses it. I can't remember where I found the part number for the head. I think it was on renntech somewhere.
Here's the other thread, but no part number is to be found there.
http://986forum.com/forums/showthread.php?t=14296&highlight=valet+key