Here's another idea on how the origin should be presented:
QUESTION: How much origin story should Green Lantern fans expect to see?
LAUREN MONTGOMERY: As we had already done the origin story a few movies back in Justice League: The New Frontier, we really didn't want to spend a whole lot of time telling that same story over again. So in Green Lantern: First Flight, the origin story is over and done before the opening credits. That way we get right into Hal Jordans first adventure.
They can do something like that for the first 3 to 5 minutes of the movie.
What I'm trying to say is that the origin should serve as a "cold open" (a prologue that comes before the credits roll). That way the movie can go straight to the plot without wondering "how did Pete get spider-powers?"