There may be a more simple explanation for these Kukri without a kaudi.
When looking at the karda, the cut out on the blade can be used to get a firmer grip on it, more of the hand.
Looking at the larger Kukri and the curves of the hilt at this point, the same reason can be applied, move the hand forward creating a more controlling grip and thus creating a hand and half use if required.
Gav
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