Hi,
I am behind double NAT and therefore do not have my own public IP, but can ask my provider to redirect a port for me. They are not so willing to do it either, so I came up with the idea that it might be possible to "bundle" some services into one port? E.g. instead of forwarding 80 for OMV web interface, 32400 for Plex and 8081 for SickBeard, it could be like: ipaddress:someport/web/, ipaddress:some_port/plex/, ipaddress:someport/sickbeard/, etc?
Also, if it will not work I will just ask to forward port for OpenVPN and manage all services like that, but I often use computers that have restricted access and therefore I could not use OpenVPN there.