Hard-coded subs plus external sub file

[MikeBin]

Although it does not happen much, I have sometimes gotten video files with hard-coded subtitles in a language I do not speak. I can download subtitles in another language, but then there are two subtitles on screen. I found that by setting opacity to 100 percent in VLC, that the external subs appear in a black box. That is very good, but I'd also like the hard-coded subtitles to be as "invisible" as possible. Is there a way to do that? If so, how?