I understand what you are saying and I agree to quite some extend. I am not sure why this subtitle (and similar ones) are exactly rejected. I GUESS it's all those music characters, but it could be things like the few repeats "(MUFFLED SCREAMING)" around line 190 too. Although I think this SHOULD not be the problem.
This filter is against abuse, but at the same time it is also some kind of quality control. According to non-HI subtitling guidelines for many languages it is 'not done' to repeat the exact same text too often too close to each other. The idea is that the person watching the movie can hear/remember it is the exact same text, and then the subtitles don't make sense, since they actually only distracting instead of added value. But yes, that is the case for NON-HI. For HI subs, repeating makes all sense. And yes, it should not be that you have to work around some filter, resulting in a lower quality subtitle.
I think those lines with ♪ are the problem. See for example lines 95-154 with 30 times "♪♪♪" in 60 lines... So you could do a little experiment:
Remove all those lines with ♪ signs (nothing more) and see if you can upload. If you can, than my above solution would be a good one, allowing you to upload good (HI) subs, but further keep the filter.