Strange UPnP issue

[SoundAdikt]

but what I’m unsure about is whether upmpdcli can still provide a connection to Qobuz via Kazoo given that Linn has integrated Qobuz and indeed Tidal into this control point app. 

Unfortunately not because Kazoo relies on the Qobuz capabilities provided by Davaar - the firmware stack that runs on Linn DS players. The closest you would get is running the full open home stack available at openhome.org - much of Linn's firmware is based on this. Alas, this is not integrated with Moode.  If it was, then things like in-sync multiroom playing should be possible.