As you hint at in your post, you would just be using the Denon as an expensive switch (assuming there is a suitable output).
Sonos soundbars are really designed for TVs rather than projectors. There is also no place for a third party amp in a Sonos HT setup.
So if you want to use your HT system with a projector I would suggest you need a standard HDMI switch to accommodate your multiple input devices.
The output from that goes to an HDMI-ARC audio extractor, such as made by HDFury and Feintech.
Audio then goes to the Beam, video to the projector.. You can't avoid a long HDMI cable somewhere.
This would give you proper surround sound, with capability for Atmos and lossless audio.
Im sorry I didnt quite understand.
Would a Sonos Port work in order to connect the speakers wirelessly to the Denon Receiver? In other words connecting the Sonos Port’s audio input to the Denon’s audio output? I already have my smart projector (which is almost like a TV itself) connected to the Denon receiver (this provides both audio and video).
Thank you very much for your help and response to my question.
It is possible to use the Port to send audio to the Sonos HT system. It would be stereo only and there would be lip sync issues because the audio would lag. That would seem a shame to me and a bit of a waste of a surround setup.