Horizons How to invert X-56 slider

After much messing about I've finally managed to bind my reverse thrust to the X-56 slider button as discussed in this post and described nicely in this Redit thread, however I would prefer to have the slider operate in the opposite direction. That is FORWARD while activated, and REVERSE while de-activated. Originally I thought this would be a trivial change to make but I for one cant workout how to do it. Anyone know?
 
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