Hah, that probably would have been the way to do it if I had been a thinking man that night. On finding that it was apparently reversed compared to the Bonanza, I spent a good bit of time figuring out how to subtract negative numbers and ended up with this:
AC11_Cowl_Flap#@ 16384 - -32767 / 100 * 0 max 100 min (>A:RECIP ENG COWL FLAP POSITION:1, percent)
@fredgarven I understand that the # signifies the end of the preset name and the @ is the incoming axis or passed value, but what's the significance of putting the #1 @? What does that do, invert the input?