You could try and cover them. I would think this would work as long you as kept air flow (for hum and temp levels). This method as far as I can see would require this daily attention of covering and uncovering though.
I am not an outdoor grower, I have been around a couple crops. I stick to indoor, with this in mind I would think you would have to keep this up beyond a two week mark. I have had plants come back out of flower and back into veg. You have to control their day and night cycle to get them to bud. Any extreme interruption to the 12&12 would only increase the amount of time they will take to mature and ripen.
To be sure, move them in and out everyday...