Like 420 said you can pump out buds from a photo period plant simply by taking cuttings and cloning them. I personally would prefer sativas or indicas over ruderalis but that's a personal choice.
Also I would never in my own setup ever start a plant at 12/12 from seed, there's a growth period and a flower period and a little thing called the circadian rhythm, which regulates rest, activity, growth, hormonal releases, flowering. There are studies showing a much higher incidence of hermaphrodites developing when you do this. I'm not telling you what to do just letting you know what may happenot if you do.
There are many here who would disagree and they are welcome to their opinion on this but mine is just do it how evolution intended. 16/8 Wait till 4th or 5th node and flip to 12/12 too easy. Good luck! Oh yeah you can do 12/12 from clone.