I’m not really a fan of cloudflare tunnels, but I guess thats an option too

You can’t expose ports on mobile data. You can ether host the web server at home or on a vps or use something like tailscale.

You could try tunneling usb from the host into wine with usbip, but I have a feeling that this wouldn’t work

I use traefik, but caddy should work too. I can share the docker-compose files I use later.

I didn’t understand the docs either, that’s why I’m using https://github.com/girlbossceo/conduwuit insted