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Not sure I completely follow the question.

If you want to use a dummy zone, you can easily use ZoneMixing to link it to other zones. But note that ZoneMixing has no impact on the source zone, only on the receiving zone.

A better option may be to use EMS (EnergyManagementSystem) to control the ideal loads system. If you have flow and supply temperature data, then you can use EMS to specify the ideal loads mass flow rate, temperature, and humidity at every timestep. But note there is a known issue regarding this. If the ideal loads object doesn't think there is a zone load, then it will be off, no matter what the EMS flow rate says. See issue # 5788 for suggested workaround.