have you guys found a solution for this ?????
if you want to use only jinx! [not other ] then there might be some alternatives
like you dont even need an ethernet shield. you just need an arduino connected thru USB..
these terms universes/ channels are big headache and for matrix type setup you would face difficulty in pixel mapping in patch setup in jinx if you have irregular number of channels than matrix dimensions ...
so better way could be tpm2.net mode ore glediator mode in Jinx!.. so now no banging with universes just add correct number of channels and patch pixels correctly ...
you said you wanted wired control but if you wished wireless control you could use ESP8266or Esp32..those are far better than Arduino .