The beep is the “beep.codec” file from the system, so if you change that to (whatever), then sure. It’s probably something you’ll have to do from the console, though, since the system recordings can’t be overwritten from the GUI.
The beep recording is hard coded and would require a feature request to give users control of which file to play. You will note that it’s defined in context macro-one-touch-record in the file /etc/asterisk/extensions_additional.conf, so you could use the overrride file to “fix” the macro for your purposes. Not something I would recommend unless you are comfortable diagnosing and fixing potential future issues if an upgrade breaks things.