How can I dynamically change the scale of an object along a single axis in a single direction?

I want to be able to have an object that the player can scale along a specific axis, but only in one direction (ie: I want a box to be extruded along the positive x but not along the negative x). I have set it up in blueprint where the object scales along the axis, but it does so in both directions.

I have attempted to change the pivots of the mesh in Maya so that the pivot is on one side of the object, but when I re-import the fbx, the pivots seem to default back to 0,0,0 so that doesn’t seem to be a solution.

If anyone has any suggestions for solutions to this problem, they are appreciated.

I took a quick look and didn’t see an obvious answer myself, but someone else might now. One idea, maybe a scale + plus a translate would do the trick.