Thank you much guys for the observations! I was afraid this was kind of esoteric and might not draw much interest.
Colin, there have been articles in the past on British or European hilts on Indian or Middle Eastern blades, and the 'phenomenon' seems to be more a matter of diplomatic gestures as well as personal flamboyance more than anything pragmatic.
In India during the 'Raj' British officers commanding native regiments took to designing uniforms after Indian costume and styles, even wearing turbans with their jodhpur pants and riding boots, etc. Naturally it was pretty flashy to have a really exotic blade of middle east or Indian style. I have a M1796 officers saber with yelman (compared to Indian tulwars with that feature, as well as Ottoman pala/kilij).
Indian figures of prominence in princely states also very much favored British blades as signature connection diplomatically or gesture of solidarity perhaps. I have a tulwar with a gilt 'warranted' motif (possibly Osborne? or one of the makers of this period using the term on blades) M1796 blade.
During the Sikh wars in India c. 1830s the British were amazed by the deadly swordsmanship of these warriors. They were stunned and dismayed when they discovered that the 'secret' of the deadly sabers was simply highly honed blades and that these were actually discarded old M1796 blades!
These were constantly sharpened , oiled and kept in wood scabbards.
The issue with Indian blades, particularly wootz, is that while having superior strength and beauty in most cases, could often be equally opposite, brittle and less than durable. As noted, the spring steel in English blades was profoundly favored (despite detractions).
The Khyber knife examples mentioned were actually tribal blades mounted in European style Afghan hilts for tribal levys in post Afghan war Afghanistan c. 1880s.
Very valid point about the hand size, in fact British sword hilts for native forces were designed with the same regulation form but smaller (this was with the M1908). Other earlier examples also reflected this.
There is virtually a whole book in studying these cross cultural hybrids, and I hope you guys dont mind my elaborating on what you already noted. Its been sort of a pet area for me over years, and I get excited
Kinda hoping that maybe others out there might have examples or seen them, just as you both shared here. Thank you again!