Awesome write up!
I‘d also probably add that, at least for me, the FA nib with the needlepoint (spectarican) customization is not the easiest daily writer and so it was relegated to either my desk or a padfolio I dont use much. Plus, as you noted, the feed does not always keep up. I would say that the strokes required for western letters are much longer and require more ink than those that would be written in the east. Also, the slower feed in the context of spectarican or copperplate forces you to write slowly and not rush, which is what you’re supposed to do anyway.
I’ll have to send you a frankenpelikan, it’ll flip the whole thing on its head—modern body, filling system, and feed, but a hand-selected vintage flexy nib.
I did carry that Wahl Pen for about two months as a daily—it never leaked. However, with old pens that use a sac, you always run the risk, but that risk is usually minimal and you can reduce the risk if you carry the pen in a case (like the Manhattan postage case I picked up on here in a massdrop exclusive drop). I actually prefer sac or piston pens over coverter pens, even though the former is more likely to leak—I find they flow much better and more consistently, on average.
Hopefully this means we’ll see some more flexy writing here on Massdrop!