If i were in your shoes, i would have two tents. One for vegging running at 24hrs/day, and the other for flowering at 12/12. When you are ready to harvest, just keep some buds, branches and leaves on the bottom of the plant. Place the plant in the 24hr tent, and let it re-veg. Because the plant already has the root structure, in 4 to6 weeks, it will be ready to flower again, and put the re-vegged plant in the 12/12 tent. You could have harvests every 3 weeks this way.