Several of these tools over the last couple of years, I use https://github.com/kaegi/alass. Maybe you could manually setup a cron job over your Plex Library.
I tried a couple of these command line tools recently, alass was the best of those. Really fast too. Still, it didn't work perfectly; I had subtitles for a different cut of a movie, it got two out of three segments right, but I had to manually fix the last segment. Either way, this is great development, I remember fully manual syncing being really troublesome.
Yeah, that's what I really need to do, just let it crawl through my library. Because I'm super lazy I want there to be a *arr project to manage this all for me and let me set things to "need fixed" and have it leave alone things I know are correct. I had high hopes for Bazarr but for some reason every time I've tried it it's fallen over after a few days , this would be a cool feature for Bazarr to add.
Well I'll be damned, it looks like they have integration with this tool (from the post), very cool. Looks like I need to spin that container back up and track down what brings it to a grinding halt so I can finally fix it. Thank you!