I agree with everyone here. I was working on some arranging projects and thought it would be easier to show you. It’s easier for the right hand to play the same notes ascending and descending. So, the way it is notated here is how I (and I think most) harpists would play the passage. To alternate hands would be buzzy and difficult to place. Good luck with your project.
Don’t worry about how we play it, just use the clearest notation. But you have a bigger problem. In that range the strings are sustaining longer and their is a risk of it being very buzzy to go over the same strings over and over. Not a problem an octave higher, or with the hands separated by an octave. Make sure you need that exact pattern in that range first.