Interesting discussion veering off to the infamous "name game" :-)
Yes, it has a Cho, which is a feature of Nepalese origin.
But it also has an Indo-Persian Mughal handle, which is seen on Sosun Patas .
Yes. There were longer Kukris , but what prevents SP to be shorter than the average?
Yes, Moghul SP often had yataghan-resembling, or even pure yataghan, blades. But the Indian ones had very different configuration of blades, often similar to the presented one.
What I am driving at, Nepalese armory had a mixture of indigenous and Rajput weapons, and hybrid forms were inavoidable.
Perhaps, I just forgot to add a smiley face after my mention of SP to just acknowledge that weapons do mutate, do enter "holy matrimony" :-) with examples from other cultures , and the final results are unpredictable, difficult to pigeonhole and ... beautiful!
Please see Artzi's description of:
http://www.oriental-arms.com/item.php?id=2129
http://www.oriental-arms.com/item.php?id=2052
http://www.oriental-arms.com/item.php?id=3487