OK, found a little info on what I want to try. Figured I would share
Timing clones
by Ed Rosenthal
There are several ways of slowing down the growth of clones. The first is to delay planting. You can store the cuttings in the vegetable chiller section
of a refrigerator in a plastic bag, the way you’d store lettuce for about two weeks or longer. This will weaken the clones a little and they will have
a lower strike ratio. However, it may be a worthwhile trade-off. After the clones are cut they can be left unpruned or trimmed for planting. Then dip them
in a 1% hydrogen peroxide solution to sterilize them to prevent infection. A 1% solution is made by diluting one part drugstore hydrogen peroxide to two
parts water that has been boiled and cooled. When you are ready to plant just take the clones out of the bag.

The cutting state is perilous for plants so a good environment that promotes active growth minimizes risks. Once the cuttings have formed roots and are
growing new leaves, their metabolism can be slowed down. There are a number of ways to do this. Plant metabolism and light requirements slow down in a
cool environment. At 45-50°F (8-10°C) the plants remain in a nearly suspended state. They require only 150 watts of fluorescent per square meter (15 watts
psf) and very dilute fertilizer. When you are ready to jump start them, place them in a warmer environment with brighter light and more fertilizer. They
will quickly respond to the change in the environment.

Even if you can’t cool the clones to 50°F (10°C), you can decrease the intensity of the light and provide diluted water-nutrient mix. The growth rate will
slow.