Have you checked with the Mooneyes folks? They have developed the exact shifter that you're talking about, I saw it at the SEMA show this past November. They have been testing their shifter for some time and I think it is supposed to be ready to ship soon. So, just in case you don't want to go through the "trial and error" (possible tranny damage), you can check with Mooneyes.

Dan J

P.S. I think they were going to be selling this item for under $500.