You planning on using clones or seed? If clones it would probably work but I would spray until pollen sacks form. From seed. You could start plants on 12/12 but I would probably start spraying when preflowers first show and continue until pollen sacks form. In my experience, cs tends to cause some damage to the plant over time and it might be too much stress for a young plant. I've also heard but cant confirm that cs degrades in the plant which is the rationale for the treatment frequency so there may not be any benefit starting that early.
CS can be a bit finicky, too little and you won't get pods, too much and you won't get pollen. But if you get pollen sacks that produce pollen, it won't take much to produce a ton of seeds.