A Bluetooth audio DAC/amp. Connects to my phone. And I can use whatever wired set of earphones I want. Light gardening: earbuds. In public transport: over/on ears.
And if the DAC dies, I get to keep my earphones and just replace the DAC.
mpv is very barebones. Which is why I love it. You're supposed to configure it through its configuration file, and mainly use it with keyboard shortcuts.
Probably this.