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Some thoughts of mine:

You could simply define your own custom message called LaserScanCW or something. If you only intend to use the data yourself then it is only up to your own code to interpret it correctly.
You could "pretend" there are two laser scanners. They both spin CCW and each have their own coordinate frame. The frame of one scanner would be upside-down compared to the other frame. So basically the CCW data is published using one frame and the CW data is published using another frame.

Just some thoughts off the top of my head, hope it helps!

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