I found a epix.rb script for SketchUp on the Piranesi UK website. Although it states that it is for 2014 & 2015, I did a quick test on 2016. With Piranesi / Vedute installed, the plugin seems to export a valid epix file.
If you want to test it for yourself, the script should go into the following directory:
C:\Users\YOUR USERNAME\AppData\Roaming\SketchUp\SketchUp 2016\SketchUp\Plugins directory
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