I’m 55 with mild to moderate hearing loss.  Like many who have commented before, I wish there was a SONOS wireless headphone solution.  Literally, have the headphones be a speaker choice from the app to direct audio.  Since that is not a big focus for SONOS, I have been trying all kinds of potential solutions.  My latest test has been an acceptable success.  I recently bought a pair of Apple AirPod Pros (2nd gen) and use the “Live Listen” feature from my iPhone.   With your AirPods in, enable the feature from your phone, and set near the SONOS soundbar or on the coffee table / side table in a surround sound room.  The sound is amplified and pushed to your AirPods.  Plus if you are using the Audiogram feature, as well, on your iPhone, you will have a properly sounding balanced audio stream that matches your hearing needs.