Shownet on GrandMa3 mode 3

Greetings,
We are running ShowNet in the Venetian Theater using grandMA2 to control houselights. We upgraded our console to grandMA3 consoles, including our nodes. I did some research that ShowNet is not supported on Mode3, only Mode2. Currently, if we use Mode3 on the show, the other console, instead of having a backup, is using the console on Mode2 just for the houselights. 
What can we do to connect the ShowNet through grandMA3 on Mode3 to control our houselights? Thank you.
Regards,

Marlon Pagaran
Lighting Manager
Entertainment - Technical
Sands China Ltd. – Macao, SAR China.

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