In the past I have used a rope tied to a high tree branch or my boat building shed roof.A high fastening point gives a nice long swing (hang time)The grab was like a ski rope, by running and propelling in the derection required the feeling of rotating in the air was achieved (kinda)Grab was above head height,tried a harness but seemed to feel better just swinging on my arms.

Remember also in the real world,foward hand down as soon as you leave
the water. hard or soft (depending on how fast your kite turns)so as your kite is just ahead of you land.