Ok, I normally stay out of the chat as much as I can , but this is a bit sketchy.
Although I don’t not think you have bad intentions, I must advise anyone to not do this.
What is going to happen: All your Plex traffic will be send to a server that has full access to anything you send to it! It can see your Plex client codes and everything!. Do not do this!
Oh , and I do not grant you the right to distribute any version of the app modified in this way!
If you want to help users, explain them how they can setup a reverse proxy themselves that will handle the upgrade to TLS 1.2. It that way they are in control, and are not compromising their data.