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plex-audio-subtitle-switcher
Change default Plex audio and subtitles for an entire series, all at once.
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Try this: https://github.com/gstacks13/plex_set_tracks
I have had great luck with PASTA (https://github.com/cglatot/pasta) to set specific audio or subtitle tracks as the default for specific TV shows. I think you could run it pointed at a larger selection and set all the subtitles flagged as "English - Forced" as the default. I have mostly used it for Anime series, some with dual audio tracks, and often with different sub tracks (as in, full english subs, signs and songs, etc.)