I’m also using this and it’s working like a charm for me (at least on a RPi3 with OSMC): [HowTo] Spotify-Connect support via Raspotify (LibreSpot) Just not sure, if it’s also working on the Vero 4k…
Having a Spotify Connect option natively on all OSMC decides would be awesome! Maybe even like AirPlay is already present (no addon or service under MyOSMC needed) 
And it would be awesome, if a OSMC Spotify Connect option would allow playback without a premium account… Which the Raspotify option doesn’t allow currently (can anyone explain to me, why?).