You can do it as I do it every time I put the car away wet in this weather, I now do it without thinking.
Try this, switch off the engine, handbrake goes on automatically
turn on the ignition, press the footbrake, while holding the footbrake on flick the handbrake leaver this puts it off, turn off the ignition, it will bing at you saying put the handbrake on, switch off the car and get out.
If this does not work let me know and I will go and do it slowly and think about what I am doing