So far so good. The scheduled power outage started about 7:40 am, but I was able to quickly restore power to the fridge-freezer, the NBN box & WiFi router, the lizard's heat lamp and lighting, and my working from home monitor, laptop, etc.
I have the Vehicle-to-Load adaptor plugged into the car, two extra heavy duty 30 metre long extension cables plugged onto that inside a weatherproof power board box, and a mess of additional power boards and extension cords inside the house. Fortunately, apart from the fridge which is directly connected to the V2L adaptor, it's all very low power so having lots of long cables will be OK.
Being able to work from home pretty much as I normally do on Wednesdays is nice, but not having to worry about everything in the freezer defrosting is really, really nice.