If it qualifies for a warranty claim it should be a warranty claim. I don't know if pen people are as twitchy about chain-of-custody as watch people but if they are, "get someone to fix it" is a collector faux pas. The show is probably a good opportunity to get something to use in the meantime. Do a report. I'm curious to see what's there.
Not only do pen people not give a damn, there's a whole profession of people who fix up nibs called "nibmeisters" and some have months to years long waitlists because they're so in demand. We talked to some folks who recommended visiting the pen show for this exact purpose. Regardless, I'm confident my partner will be keeping that pen for herself forever. I still gotta do a Japan trip report let alone the pen show lol but I'll try for ya.