How to Link an AutoCAD XREF to Layer other than Layer 0

I am using the FeatureWriter transformer to write an AutoCAD drawing (*.dwg). That’s working great. Within this drawing, I have an XREF. I am using the autocad_xref_name and autocad_xref_path attributes to identify the XREF drawing. This is working BUT the layer is linked to Layer 0 in the primary drawing. Any idea how to link the XREF to a layer other than Layer 0? This would allow the AutoCAD user to, for example, turn off the XREF drawing by freezing the non-Layer 0 layer. I tried the autocad_layer attribute but that just creates a new layer. Any ideas?