I meant to reply to the OP, but I guess I never did - Good idea about using the inkjet cart cleaner to flush the pen. I think those staedtler pens are great.
I dabbled in continuous flow mechanisms for the spectrum arts window drawing project, but never got anything working beyond making a big mess. My target was a pen barrel and tip, with a small piece of felt in it, with an IV line stuck in it, and ink in the IV bag. The bit I was missing was the drip chamber - where the flow is regulated, so it just dribbled out continuously. I had hoped that the felt and tip would stop that, but there was just too much weight behind the ink.
Once you get the continuous ink supply working, you've got to deal with the tip wearing down. All these factors add up and make for a significant engineering task, so I opted out! The commercial versions of this kind of thing (ie plan plotters), tend to use disposable pen cartridges - ball point or fibre tip.
My best results have been from kuretake zig millennium pens. I did a big, A1 skull, a dark one, over two days with 0.05mm millennium, and it was still going by the end.
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