Keep text for hearing impaired..

[napgiver]

More often then I like, I'm needing to remove all normal dialogue while keeping all text for signs, and occasionally, songs. The signs in these srt files are always fully uppercased. As of right now, I haven't found a way to automate the process. I have to open each file, go through and manually delete all normal dialogue, while keeping the signs that are fully uppercased. When I have anywhere from 10 to 30 sub files to edit at a time, it becomes very time consuming, and, a strain on the eyes. I've looked as best as I can for an invert option to "Remove text for hearing impaired" which would make the time needed to edit these subs much, MUCH shorter.

Is there a way to remove everything but the hearing impaired text? Like a "Keep text for hearing impaired". Any guidance would be greatly appreciated.

p.s. If there is no way to do something like this at this time. I'd like to formally request a Keep text for hearing impaired feature as an invert option to "Remove text for hearing impaired" to be added...If possible 🙏