One simple option would be to leave a cheap phone or tablet (or Smart TV) around with Spotify installed for people to use, and still use Moode.
Failing that, you might want to look at piCorePlayer which can run Logitech Media Server (LMS) - that will allow you to do exactly what you're looking for with the Spotty plugin, though I think you'd need more than a Pi Zero to run LMS. You could run LMS on a separate Pi3B (or other computer) and use the Zero as a Squeezelite player.
Failing that, you might want to look at piCorePlayer which can run Logitech Media Server (LMS) - that will allow you to do exactly what you're looking for with the Spotty plugin, though I think you'd need more than a Pi Zero to run LMS. You could run LMS on a separate Pi3B (or other computer) and use the Zero as a Squeezelite player.
