Auto-dl/irssi - any way to connect through a cgnat (5g network) to my irc server ?

hi, basically i have my own irc server at home but the network is a 5g router
so most ports are closed.

ive been using services like serveo & telebit on my server to open the irc port 6667 to the www so i can connect my seedboxes.cc seedbox to my irc server which i use to load torrents onto the seedboxes.cc seedbox.

but now these services have stopped working so i cant connect my seedboxes.cc seedbox which is a real pain for me, having these connected via the irc is the main thing i need working in order to keep/use the seedbox.

ive spent hours & hours trying to find an alternative but cannot so this is basically my near last attempt to get it working again otherwise i'd have to let my seedbox go :(

ive been looking at things like https://github.com/rofl0r/nat-tunnel but im not sure if that would be against the rules etc

(1) is there any way maybe with that nat-tunnel or using the vpn tunnel you guys already provide to get my seedbox auto-dl to connect to my irc network ?

(2) would it be against the rules to tinker with trying to use things like that nat-tunnel ?

thankyou !