Something wrong if your LEDs only last 12 months. Every LED sidelight I've bought has outlasted the car! I agree though, turn your lights off, turn the engine off. Turn the engine on, turn the lights on. No voltage spikes, happier bulbs.Turning the lights on and off manually is the best way to extend bulb life (do not allow ignition switch to do that).
I'm using front LEDs right now which are good for about 12 months.
It only takes 2 minutes to change a bulb (even the n/s one which needs the plastic shield removed).
Small hands help.