i never went to search for a k series engine, but i think it will be very rare at this time.
i expect that in the next few years it will be available in markets, as pak suzuki introduces more vehicles with k series engine.
the k10b in wagon r produces 70 hp, which is close or better than what the original engine of margalla makes.
if my stock margalla gives 12kpl fuel avg, what would be the point of a g series swap, except for performance gain (which again isn't very much)
if someone successfully swaps a k12b in a sf series chassis, i think it would be fast and a very cheap daily runner.