There might be a problem with the lockup switch first approach.
If you don't control WHEN the transmission shifts (i.e. with the rotary switch) then it seems probable that you have some gear changes under power without any tc slippage (oops, didn't anticipate that downshift in time). I don't know how big a concern that is though, might just be an occasional hard shift.
WINDMILLS DO NOT WORK THAT WAY!!!