Root Grafting on a Yamadori Juinper

Can you Root Grafting on a Yamadori Juniper Transplant from the Fall transplant 2017? Thinking of turning Juniper into a Forest Layout it is a long main Trunk . Tree has Branches only on one side of the Main Trunk only. Will have photos when weather warms up and out of Make shift Green house ( Tree is all cover up and back in the Ground to keep the roots warm and in there training pot) thanks Greg