Pi no longer needs openVPN. I also had to remove services that were added when I tried to install Docker.

• sudo systemctl disable docker
• sudo systemctl stop docker
• systemctl stop openvpn.service
• systemctl disable openvpn.service

Now sudo systemctl --type=service shows no vpn services, and tun0, tun1 and docker0 network interfaces have been removed.

Pi is just an ssh server and print server now.

Note: I nearly gave up on this a few times thinking it was way too hard. It proves that a bit of persistence pays off. Don't give up until you've given it a good go.