Grodan makes what they call Mini Cubes, they're like little quarter-inch cubes of rockwool. You could get some small containers and fill them up like you would soil, set up a dripper system, and see what happens. I've used it for mothers, hand watered under a t5, and it worked great. I guess the biggest thing would be to find the right pot size. Fuck around with it and see what happens. And let us know.