You can find Japanese offerings on Amazon India and if needed, get it directly from Amazon Japan (i do both). You can also contact the resellers (who import from Japan and sell on Amazon India) directly for a better deal. For example, you can get the Tombow pens from https://www.foremostindia.com/
You should also check Aliexpress. I came across a rollerball pen which can be refilled like a Fountain pen which is neat.
Finally, your quote
>Yes I am aware but the problem is I think they they import their nibs and just make the body of the pens. Somehow I don't feel like buying this Frankenstein and would love to buy the complete product if they make it.
This is quite the wrong way of looking at it. These guys are very good and are optimizing their product based on their available skills. Making a nib requires metallurgy, high-precision CNC etc. which as small specialized Artisans they cannot afford to setup. So they focus on what they are good at (this is exactly similar to specialized Artisans in Germany and Japan; you find entire video series on Youtube; eg. https://www.youtube.com/watch?v=f5dekz26Kdw). For example, i have a Tombow pencil sharpener where the plastic body is made in Vietnam but the blade itself is made in Germany!. If you are a Fountain Pen guy you should definitely get one or more of this.
Finally, i should note that a lot of branded Pens are manufactured in India; eg. Parker Pens are manufactured by Luxor India and exported.