But then building it still requires whatever scripting tool you use. Including the bash-ified version would not for practice, as it wouldn’t be very human readable and would have to be kept in sync with the source script. It’s much cleaner and simpler to just require python for your build environment.

I don’t see why bash would be used at all here. If you want something that doesn’t need another interpreter, then just compile a binary.

One that can take a USB storage device or an SD card would be much better. Same result, but no messing around with discs and it can hold way more music.

I did exactly this as well. Only I bought my own 433Mhz weather sensors. They are cheap and the batteries last for ages.