The problem you will have, is containing the roots, you could use this method, but will have to get a rockwool cube big enogh to support a full grown plant, also you need to ensure that the roots remain in total darkness, ensure you use a full hydroponic feed, and remember that you will have to monitor the moisture level closely, as they they will dry out quicker than soil, but apart from that there is no reason why it wont work, good luck and keep us posted.