I will definitely keep you updated.
I spent a little time in the electrical diagrams this morning to determine if the BCM cared in any way whether the transmission is a MT or an AT.
Apparently, the BCM is not involved or cares which transmission the car has.
So, if the above is true, you can use a BCM from an AT car in a MT car.
I'm going to buy another used BCM having the same Software level of 44/03 (44th week of 2003). The hardware build week is different from my original, but that really shouldn't matter. I think it's the Software level that is the most important.
The used BCM I am using now, matched all the build and level numbers, but still does not allow manual control of the rear wing, traction control or tow alarm disable. It does pop up the rear wing at speed as it should and then drop it down when it's time to.. Those missing functions could just be a result of the used BCM's age and gradually losing function.
I'll post an update after I receive and install the next used BCM.