If you have Qobuz app and Mosaic on the same device you can easily toggle between them . However I am wondering why you want UPnP to be on Qobuz? Is it because:
Let me show you something:
One is Qobuz Connect the other Mosaic. Apart from some minor details regarding controls they are virtually identical. How do you get that big image with Mosaic? Just swipe upwards from the white line at the screen bottom.