I don’t think it would exclude non biological entities. If neurons are simply the way for such a structured field to be generated, sustained, and modulated, then presumably any physical apparatus that produced “that type of field” would produce experience.

Or a hybrid. We already know there’s a long range binding problem in neuroscience: how do physically separated neuron assemblies construct what we report as a gestalt experience.

This is a non spooky answer that also points to possible applications like cybernetic EM field modulators.

All of this is complete fantasy, of course, but the hypothesis at least has the virtue of not getting too far over its skis.