@cbwonderboy take a look at the Linknode R4 Wifi 4 Ch Relay Board thread for a board with 4x single pole changeover relays controlled by an esp8266.
In theory it should run the same firmware with some modification for the additional channels.
That sounds fairly standard, many heating controllers and timers have 2 independent single pole changeover contacts.
In the guide’s “Physical Connections” section it states the latest version is only a single pole single throw device as the normally closed relay contact isn’t available. You could (at best) use this device to switch another bank of relays.