Insight To Hog 500

I need to find a way to hook an ETC Insight console to a HOG500 console. I would like to kind of use the Hog500 as a passthrough of sorts for the Insight so that I may use only one universe. Any suggestions on whether this is possible and how?
Comments
You'll need a 3rd party DMX merger. Quite a few different companies make them.
Which model Insight do you have?
The Insight 3 support DMX input. You might be able to use that, with the Hog500 feeding the insight, and the Insight driving the rig. The Insight 2 may have the same feature.
That would allow both consoles to run cues together, but he still needs a way to join both DMX outputs on to a single universe.