I'm not all that familiar with that line so I looked at the manual and see this may apply:

[Link: manuals.denon.com]

If I'm reading that correctly it seems you can set the audio input mode to be your analog (or digital) input while on your NVR's HDMI input.

So if you goto the input assign screen first and set, for instance, AUX1 to be HDMI 3 and Analog 5, I would think that if you configure that input per the link above to have Aux 1 audio source be analog that when you switch to Aux 1 you will get the HDMI video and the audio from the analog input from your streaming service.