I already had the idea - but the size (over 1 metre long) was too big for my desk. I then decided on a Sonos Beam (https://www.digitec.ch/de/s1/product/sonos-beam-wlan-airplay-airplay-2-multiroom-system-8904862). To get the sound to SONOS, I use the Delock HDMI Audio Extractor
(https://www.digitec.ch/de/s1/product/delock-hdmi-audio-extractor-extractor-video-converter-2485634).