Why not just try the harness you already have and see if you like it? I started with a windsurfing harness I had. then bought a wing harness. Now I put a hook on a pfd vest I wear. It's just an experiment.

I started that way with a homemade hook. It worked fine. My mate did the same thing and is still using his.

I made a wing waist harness based on the Dakine Solo. It was better and very comfortable.

I've sort of given up on the harness. It's only really necessary if you're doing long upwind runs. There's no need for a harness for general riding about where every gybe or wave ... or fall ... gives you time to rests. The harness loop can get in the way, particularly during tacks.

The real reason is I got catapulted into the wing a couple of times. The impact was unpleasant and it introduced a whole new level of ways to destroy a wing.

The ride engine nug is good for wider harness straps. I've broken one using it with big wings in heavy wind so now I always make sure to have a spare in my truck.

I occasionally slide a hook onto an AXIS waist leash, it rides up a bit then stabilises. One hook slides on, just about, another has too small a hole.