You don’t have to be an exit node to help; Have a look at setting up a Tor Snowflake proxy. I haven’t looked at Signal proxy, but I’ll check out that blog post.

Have you considered self-hosting? If so, there are a couple of options, such as Calibre-web.

Have you had a look at binhex’s privoxyvpn docker container? Sounds similar to what you’re looking to do.

I like it. If I didn’t get the reminders, I would forget to rate things I’ve watched.

Plex can do it, but I assume you need a Plex Pass. I haven’t used the feature myself.