Regarding the flow of the pen, the indian inks we recommend have good flow capabilities like Pelican or Pebeo, and the nibs are tuned for them, on the other side carbon inks work wonderful and the maintenance is not a problem, as when the pen is unused the vapor chamber keeps the ink fresh for months without problem.
Nice concept. Here’s some immediate questions which come to mind:
You said you are tuning these pens to India inks like Pelikan or Pebeo. I know nothing about Pebeo, but I know a good deal about Pelikan. Are you referring to their Fount India ink? If so, that is already a fountain pen ink. Or are you referring to Scribtol, which is not? Because if you are referring to Scribtol, you really have something there. On the other hand, you also mentioned Platinum Carbon Black, and inks like it, which are already fountain pen inks. Granted, not fountain pen friendly inks, but they, like the Pelikan Fount India ink, will work just fine in current fountain pens with a bit of care.
I bring this up because your pdf files look like your pen is being maneuvered to solve a problem by working with non-fountain pen inks, but it also looks like English isn’t a first language, which is totally fine, but I am trying to understand what you are working at doing? Is this pen supposed to work with dip pen inks? Or will it still have to work with fountain pen inks. Even though Pelikan Fount India is called “India,” it is NOT and Indian ink in the traditional sense and will still work with a pen as inexpensive as a Platinum Preppy. Some clarity on the copy may help solve this discrepancy.