Hi mckay, perhaps this helps:

I have been experimenting to avoid IB data feed and trade Z13 manually too. My reason was the EU residency, so no use of SPY data, and also little, or none use of SPY-Options data. Thus, the data subscription for automated order entry looked like a pure waste for me. But the IB subscriptions needed for trading Z13 is just 1,50 USD/Mnt (ARCA:SPY) and 1,50 USD/Mnt. (options data), half of that waived by acceptable trading activity. For me, it was a clear choice, as I get the full comfort of Zorro-IB plugin and at least for stock trading, IB is a true gem.