Hello Fr3akyMurk,
A good way to mask your IP address with the one used by the VPN will be to configure full tunnnel in your VPN server. This will route all the traffic through the tunnel using the public IP address of the Access Server.
Now regarding the port forward configuration in the Access Server you can try the steps suggested in the link below:
https://openvpn.net/vpn-server-resources/how-to-setup-dmz-in-openvpn-access-server/#create-a-dmz-with-the-command-line-interface
Regards,
Marcelino