I have something similar . I have WG on the host to access my services and gluetun in a container using openvpn for specific services.

In my case I have the host wg pass through connections to the outside via iptables rules but I’m not forwarding the connection to gluetun. I have the ip of my server as my ip.

In your case as you want a commercial vpn ip as your exit ip you would need to use iptables to pass traffic between the 2 networks .