I will make the same recommendation as I did years ago for the Eclipse Kima, which was one heck of a sweet wave kite (so long as you made this modification).
Make the throw on the bar excessively long.
Yes. This is dangerous for beginners because it allows for kite inversion.
ie. If your kite is too high, and the rider depowers too much, the leading edge can dip, thus the topside of the kite becomes the high pressure side. Bam! Inversion.
Limiting the throw reduces inversion immensely.
However, an experienced kiter can use this "excessive throw" to recover from a backstall.
I love the extended backstall. The extended backstall in the pocket of a sweet wave in side/side-on is the everything. I loved to take my old Kima dead downwind of me, 10' (3m) off the water. Then I would mega-ease the bar, and that kite would powerlessly and instantly begin flying again. Man, have I caught some pure, long rides with that rig!
Barely anybody knew about this feature of the Kima because they usually flew it on the Eclipse bar. That bar had very short throw, which worked for the Thruster, but limited the Kima. Years ago, I posted a quick mod using an LF bar upgrade kite. Several people applied the fix and got more enjoyment out of their Kimas.
Here is another idea for a surf kite "system".
Get rid of the hook and chicken loop system. My board has been abused by the hook so much that I expect legal authorities to eventually remove it from my custody for its own safety.
Regarding the one pump system, as a snowkiter who like wave kites, I vote to keep it.
I have another idea, but it is patentable.