Mike,
Nice, I am wanting to do something similar because I am trying to keep from running cables around my garage this year for the rainbow floods on the other side of the driveway from the controller.
What are you feeding from the TX/RX, is it a Lynx MR16 or some other DMX controller?
My testing/options went as follows:
In my first attempt I attempted to use a EX/RX to bypass the 485 chip and feed into a 3 channel DMX controllers with the addressable dip.
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LoginI removed the SMT chip and soldered leads to it from the EX/RX using the wireless mod.
That didn't work, and I am not sure why.
So my second option is that I am going to feed into one of the above controllers via a DMX out off a nearby wireless LE, that is as long as I am not feeding to anything else. One of the DMX outs are disabled when using wireless per the manual

Finally, I have a spare TX/RX and could always do as you have done.
Thanks for the reminding me and for providing pictures.