Continued research= Ibrahiim!!!
Noticed in your last entry, then revisited your post #43.......compelling!!!
In 43, this example is intriguing as it clearly has the 'sinha' or lion head which we associate with the hilt of the kastane. While the 17th century date is in my opinion somewhat optimistic as we remain unclear on the earliest occurrence of the sinha hilt on the kastane, this coupled with the example from Karnataka, does seem to place these in Deccani context.
The diplomatic and general tribal ties between the Deccan and northern India (Afghan) regions are well established, and as seen with certain hilt features such as with the paluoar, the cross influences between these regions also seem understandable.
Is it possible that the sinha/lion head became vestigially stylized in the knob like pommel of these northern versions? We might tenuously observe that line defining the lower outline of the 'knob' being almost a jaw line! in considering such zoomorphic context.
Also found in Pant (1980, p.113, fig. 293) the tulwar hilt known as 'Marwari'. In Pant's 'system' of hilt classifications, this one is claimed to be similar overall to the 'Delhishahi' and 'Aurengzebi' forms except in the case of the knuckleguard.
In the Marwari hilt, there is a distinctly represented swans head which has a dramatic turn back form.
While Marwar was a highly commercial region in Rajasthan, it would seem that its commerce would be well known in northern areas of India (incl Afghan regions).
These Marwar hilts, in addition to the turn back swans neck, had the knuckleguard with split or cut in the center.
I would note the 'Afghan military sword' which has its distinctive split guard also with turn back of this style, and similar to that seen on these curious hilts of OP.