Help requested on a Storyline limitation

hi, as per my (long) title i have a 6-hours, all-videos course that needs closed captions in 4 languages, but storyline only lets me add just one language for closed captions.

And of course i cannot add layers or forms with text inside as it will be veeeery long to achieve.

I cannot use Rise either.

So looks like i have to replicate 4 times my 6-hours course to have a huge 24-hours storyline file just for this.

Any idea of how to get out of this problem?

thanks a lot