This post is follow up. I spent a month trying to determine if this would work, and finally just threw money at the problem. I did get lucky though.
I have a lovely pen, a Muji fountain pen. This ticks all the little things I desire most in a quality writing implement. It’s a cylinder from top to bottom, it has a snap cap rather than screw on, and it takes cartridges, to keep me from spending obscene amounts of time and money dorking with ink.
In practice, with my handwriting and notebooks, this is not ok. I found a fair number of forum and blog posts where people discuss changing nibs, but there’s very little resolution. So I did some learning, and it looks like a #5 nib should be a drop in replacement.The fine folks at Goulet Pens happen to sell a #5 Edison Extra Fine. More searching blogs and forums say it should work. $20 and a couple days later, I can confirm. My cheap pen ended up costing me around forty bucks, plus ink, but I’m damn happy about the result.