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I have found a possible solution, and I would like to share it with the community in case anyone might be interested.

In this case, one would use the model PLNTBU. This model is exactly the same as the well known REPCA; however, the advantage with PLNTBU is that one can attach this model to a different busbar the generator is connected, in my particular case I choose to do so at the POI above the main transformer. Moreover, because PLNTBU allow for additional reference signals (i.e. Vaux, Paux and Qaux) one can control two inverter models with one plant level controller by assigning the Vref (VAR L) to INV1 and Vaux (VAR L+10) to INV2 for example.

Finally, it is necessary to use the Renewable Energy Auxiliary Control Model (REAX4BU), as this component would be the interface for each of the electrical control (REECU) models which in turn send the control signals to the inverter model (REGCA).