JOINT CONTROLLED NORMALS

I have an idea to load multiple Normal maps onto one figure and then control the 'strength' of those normals by joints similar to JCMs.  For example, I might create 4 different rib/chest normals.  One each for Front & Back, Left & Right ribs.  Then when the torso (say the chest) is bent forward, I would apply the two front ribs at 0% opacity so they disapear and the two back ribs (left & right) at 100% so they would be layered on top of any existing Torso normal.  I know this can be done with the layered image editor but the process is entirely manual.  My goal is to get skeletal and muscular details that only occur when a joint is bent or twisted.  Is there any way, scripting or otherwise, Normals can be applied at varying degrees in an automated way?

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