I also host VPS for lots of things. However, I don’t think that’s what you want here. I think you are really looking for two separate things. VPN for torrenting and bypassing geographic restrictions. Spot on. Go with a cheap VPN that allows torrenting and have fun.
Now, you want to do the media sharing thing with Jellyfin. Using a commercial VPN doesn’t help here. It’s only protecting you from giving your IP address to people you share Jellyfin with. But, if you trust them to share a service from your local network, you should probably trust them with your IP. Puting it on a VPN still leaves your Jellyfin exposed on the open internet where anyone can try to break in. It’s just not your local IP. Does that make sense?
Because of the above, I would say to port forward on your home internet instead. However, I don’t suggest this either! Even if you are super knowledgeable, it’s best to not expose anything to the internet unless you have to. Jellyfin is pretty safe, but the best thing would be to use you want a VPN. So, I am a little confusing haha! Separate to the commercial VPN in the first part, you should setup a VPN where your network is the private network. I would highly suggest Wireguard. You can do all the setup and it’s a little overwhelming. Or you can try Tailscale which uses Wireguard but it does all of the configuration for you. It is a paid product but for your needs I highly doubt you would fall out of the free plan.