You can do it via snapcast. I have basically that setup. A Raspberry Pi that just has a snapcast client. Then there is a snapcast server with MPD, DLNA server e

You can do it via snapcast. I have basically that setup. A Raspberry Pi that just has a snapcast client. Then there is a snapcast server with MPD, DLNA server etc, that streams via snapcast. But given that they have other direct-playing applications it is a strange omission.