You can use your own remote JSON feed instead of using the Orllewin default. You'll need to copy the format of the main feed at orllewin.uk/stations.json precisely.
Test your JSON radio file by adding as a query string: example, when you're happy set it below and the url will be saved to local storage, reload the radio and it should use the custom url override.
If you have issues check the url and make sure your server is setting the CORS header to *