I don't think parawings are kites because you can't sine them. A kite gets its main advantage from flying through the arc of the line length and the ability to turn back with power.
A parawing can only ever pivot around the end of the bar and a tiny bit of movement from the rider's arms.
You only need one or two rules to keep things sane. One is the lengthways bar with the front lines attached to one end.
The other could be a maximum distance from the bar to the first bridle split, say 30-50cm. That gives room for sliders and pulleys and stuff but stops using kite lines.
That introduces a physical barrier by making the wing sit close to the water so that huge and/or ultra high aspect wings will not be practical.
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