first your questions

Is the tunnel solution appropriate for jellyfin?

Yes but also no. the tldr is It will work, but video streaming is against CloudFlare rules. I ran this way for about 2 years with Plex just for my own use, so for about 15 hours a week on 480p and I never got my service suspended, but I’ve heard stories of others getting suspended… So just know it’s a risk

I suppose it’s OK for vaultwarden as there isnt much data being transfered?

That’s a good use of tunnels

Would it be better to run nginx proxy manager for everything or can I run both of the solutions?

You can definitely run both solutions (tunnel points to npm, npm towards to all other services), and it saves you setting up tunnels for each service

Now for my 2 cents

As others have suggested, tailscale funnel is a valid option. A reverse proxy using a VPS is also a valid option. And as I pointed out, doing the CloudFlare tunnel is an option if you’re willing to accept the risk.

My current setup is using a free Oracle VPS with a small nginx docker container forwarding all port 80 and 443 traffic through a tailscale. On the other end is a nginx proxy manager docker container that points to all my services across the network. I have my CloudFlare details configured in nginx proxy manager to generate a wildcard SSL certificate that I apply to all my local services

Inside the network, I use adguard to redirect the domain to the local LAN IP of the nginx proxy manager server to avoid traffic going through the internet.

Then all you need to do is point the domain on CloudFlare dns to the Oracle server, and you’ll have several layers of separation between the internet and your local LAN , as well as SSL certs both internally and externally on any services you share

It might not be the most elegant setup, but I share my Plex server (as well as about 30 other things) with several other people and can handle multiple 1080p streams going through it without any issue and it’s been nice and stable for over a year without any issues