The Kogan is a Tuya based device. You could flash it with TyuaConvert to a basic Sonoff firmware and then try @ericm's firmware on top of that. But, be warned that it's a pain in the a$$.
This is why I HATE Tuya-based devices. You have to jump through multiple hoops just to flash their devices to something that doesn't report your data back to some Chinese server farm.