It would be nice to have the Nowify - a Spotify now playing screen easy installed as a UI plugin.
Try it out: https://jonashcroft.co.uk/nowify/
I don’t know if the Spotify plugin existed 3 years ago, but if you still haven’t found a solution use the spotify plugin and you will get a now playing screen with media controls.
i would rather wait for the new spotify plugin…
br
Josef