Ion Client and Enttec USB DMX

I'm currently working on a show outside of our theatre and I made the mistake of trusting other people to load the truck and they forgot the road case with our Ion in it.  I have the Ion client dongle and an Enttec USB DMX converter. Is there a way for me to use the client and the USB/DMX converter to do tech rehearsals while the Ion's road case is being picked up? 

Thanks!

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