There are three ways to access the router if you use it as vpn client:

  1. Via GoodCloud: You have done this.

  2. Via AstroRelay: www.astrorelay.com. You can access it using a relay URL

  3. Via VPN server: First, when you connect as vpn client, you should tick “Allow Access Local Network”, then you can access via the vpn IP. But you have to know the vpn IP of each router. And in your vpn server side, you also have option to allow or deny accessing to the clients.