I finished a DIY playlist launcher for Volumio.
All the details are in this imgur album: https://imgur.com/a/aiS5xp7
It uses the REST API, an ESP8266 and some RFID tags.
I am quite happy with it, it allows guest to control volumio easily.
As I said in the imgur post, this is 100% inspired by a project named Qleek. Kudos to them for the idea, I love it.