Suggestion Smash Ultimate Voice/Music language tweak

As people are no doubt well aware, Smash Ultimate contains all of the audio content in the base download, but restricts them to their respective display languages. I'm aware of mods that modify the english audio files to have japanese audio instead, but would it be possible (presumably through an exefs patch?) to make the game use the actual japanese files, to both save on space and prevent potential bugs due to modding limitations? Besides character voices, I'd also want this for music (I know at the very least the main theme is different between english and japanese, I wouldn't be surprised if there were more different songs). Alternatively, this could be done the other way around if that would be easier (modifying the Japanese language setting to display English text and images).