You're basically right but the GPO is 10A max too. Depending on the actual voltage available at the outlet it may be higher than 10.8A.
I wouldn't count on the wifi switch lasting a long time, or even at all. Worst case of it causes a for and the insurance company finds out they won't pay. I would strongly recommend not using the wifi switch at all with this set up and only ever have the machine on when you are in the same room and will be home (and awake) for 4 hours after turning the machine off at the GPO. If this solves your steaming issues and you want to leave it like that get an electrician to put a 15A GPO in for you. Don't use the wifi switch on the 15A setup.