This is your latest excuse for pushing the single is best line is it? If you don't have a second engine you can't forget to start it - dear oh dear.
The difference in a helo is you will discover the second one isn't running when either a. you do your checks properly or b. try to lift to the hover.
In the example you linked to they didn't get airborne but aborted the take off run.
And no, I haven't ever forgotten to start the second engine, even when I was teaching on both singles and twins on the same day.
You do need to get over yourself and move on from this pointless crusade.
Back to the superstitious thread - I always used to fly with lifejacket number 13 whenever it was available - many pilots wouldn't touch it.