I'm hoping that some of you experienced FPers have esoteric knowledge about where to find out-of-production cartridges for pens such as the Waterman C/F pens from the 60s/70s. I did a lot of Googling and now I know even less than when I started.
What about this: people hand-produce pens... why not custom converters?

Okay maybe not so exciting, but I've read plenty of complaints about capacity-challenged converters. How hard can the engineering be? I mean, aside from size and shape, is there anything else that stops converters from being interchangeable? Could all pens (other than integrated piston fillers) theoretically take either a cartridge or converter?
Or how about a new approach for cartridges? Like those baby bottles where the milk goes into the collapsible plastic baggies? Okay, maybe a bit fragile, but how dangerous is the inside of a barrel?
Seriously now, am I going to have to invent some gizmo just to suck ink, or has someone already come up with the perfect solution?
Thanks in advance for any help!
Petra