URLs are never used by the openvpn client (or server)
In my understanding, with latest OpenVPN AS, you connect to a "web server" and then the browser "creates" the tunnel (well, in very basic words) This you call "Connect Client"
Now, this is were precisely I'm thinking about. Instead of making the browser connect exactly to the OpenVPN server, it first goes to the reverse proxy were looking into the url is redirected to the real openvpn server.
Im wondering if this would work.
Thanks