I collect vintage fountain pens, mostly about a hundred years old with flexible nibs that allow for fancy copperplate calligraphy. These kinds of pens are very delicate and some of them are so sensitive that if you don't know what you're doing you can destroy them pretty easily. With a little bit of work and a little bit of practice I was able to learn to write with them the way they were intended.
If you had an interest in fountain pens, don't let something like this kill it. With a small amount of effort you can find a technique that works for you without being uncomfortable.
I'm just curious if you've ever tried the mirror script technique? I remember reading in Isaacson's biography that Da Vinci wrote everything in the mirror script not to code it but because that's how left-handed people were taught to write. I figure that it'd work just as well in modern days, though obviously not if you needed someone else to read it.
My daughter is a left handed overwriter and I am working with her to get her to position her paper so she learns to write under the line as much as possible without the hook of the hand. She likes fountain pens but smudges them. I used to overwrite st a young age but switched to underwriting when I got frustrated of having ink on my hand every day.
I have FAR more problems with binders, with the rings or clips getting in the way - so much so that in school, I used to write on the BACK of the pages so that the rings were to the right of my hand.
Paper at a 45 degree angle + hand below the line I'm writing be works like a charm.
The trick to lefty pens is to get BOLD tips!
When you have a thin needle-like tip, as you know, you end up stabbing or scratching the paper. But if the tip is either a big round rolling ball or nib, then it glides across the paper on its roundy edge.
I can definitely recommend the Lamy Safari with a 1.0 bold tip, or any Pilot ballpoint pen with a 1.0 bold tip. (I carry a Pilot Precision 1.0 Bold ballpoint pen with me at all times.)
Off topic, I once got a B+ on a high school physics test, but the teacher told me he marked me down from an A for having the temerity to use an ink pen.