Hmmmm... How about a dongle that plugs into the earphone jack of a weather radio?

You could get all the functions into one microcontroller chip, I bet. Too bad I'm not an analog guy. I know how to decode the SAME signals in theory but it would take me a lot of fiddling to get it right.

Instead of dumping text config file, I'd make the device a tiny web server. Perhaps bluetooth instead of USB - program it from your iphone...

Too many ideas, too little time.