Default notification tone: An inquiry

This tone is really annoying to me but not nearly as annoying as not being able to change it.

My question is this: I know which file the OS calls on and was wondering if it is possible to rename the tone I want to use to the same as the original - basically tricking the OS into playing my tone? I would backup/rename the original, of course.

The downside is I do not have permission to the folder. Is there a method like the desktop where we can change permissions?

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