"adding a USB to SPDIF converter to run AES/EBU between it and the DAC is not much different than adding the USB gizmos"
Dave, one exception in your scenario; the Aurender USB Audio 2.0 to SPDIF ( COAX ) Converter does not require external PSU compare to ISO Regen. That's one less gizmo in big scheme of things :-)
I have no experience with ISO Regen or Aurender USB Converter but since you own N100H, only you can determine which one of these gizmo sounds the best in your setup.
Dave, one exception in your scenario; the Aurender USB Audio 2.0 to SPDIF ( COAX ) Converter does not require external PSU compare to ISO Regen. That's one less gizmo in big scheme of things :-)
I have no experience with ISO Regen or Aurender USB Converter but since you own N100H, only you can determine which one of these gizmo sounds the best in your setup.