Just saying hello. The first thing I need to do is set up reverse NAT tunneling, so we can use cheap 3g/4g mobile data dongle for remote internet connection, yet get around that being behind a NAT and not having a fixed public IP address.

This is the sort of guides im reading, Ill post back when ive worked it out and maybe make a module if suitable.
https://www.xmodulo.com/access-linux-server-behind-nat-reverse-ssh-tunnel.html