PolygonCollider2d Use Z Axis

I would like to simulate PolygonCollider2D along the global X and Z axis, rather than the global X and Y axis.

I have read that Unity assumes the X and Y axis for most calculations, but here I need to use the X and Z instead, for it to work with other systems.

I have tried to attach it to a parent game object and rotate that game object along the X-axis by 90 degrees, but then my PolygonCollider2D collision shape fails verification. I figure that this is because it's projecting the new coordinate to the XY plane and is not able to construct a shape as the points are all along a single line.