Bigb just did the retrofit with a single switch on his 2001.
http://www.986forum.com/forums/showthread.php?t=13866
We have done 100 of the OBC retrofits over the years. With the stalk or switch. No one has asked me to do it with 2 switches, but it can be done. Kind of silly if you ask me. You will get all the OBC functions with a single switch, but you cannot set the speed gong.