JudicatorKhoury wrote
Am I being stupid? Can this be done?
For some electronics that you are putting in your backpack or cabin luggage, you may be asked to take them out of your bag for pre-boarding security checks (x-ray, etc) depending on the airport.
I think you can put them in your checked in luggage. I don't know if they will try to open it or not - which means they would rip it open or break the lock if they need to.