Headlight doesn't come on until you have oil pressure. That's an old Murphy switch trick.
It's easy, it doesn't backfeed the oil light. I've done it numerous times on machines that need all the help they can get starting, like my quad I use for plowing snow.
When I hit "stuff" with the plow, I generally stall it and by the time I fix the "stuff" I just hit to cause the quad to quit, there is just enough battery to crank it over once or twice. With no headlight on, I get twice and on a good day, almost three times.
I did it on my R1100RT, my Kawasaki, a few of my friends' bikes and haven't had an issue yet.