Where did you get your Athom smart plugs that do metering and are HA compatible?
I got them from Athom directly. They used to ship out of China (quickly!) but in the last couple of days they emailed to say they have now opened a distribution center in Sydney, so I expect these to be available even faster.
I got the ESPhome plugs, for no particular reason. They also have Tasmota plugs, which are what is currently stocked in Sydney.
Your post about heat pumps is amazing. Thanks so much for pointing me to that.