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You can always submit notice of link update to editor or even better become editor yourself and then you can fix your sites URL anytime you want. ;-)))
(Ivan's shameless editor recruitment tactic #42)
I've redirected a URL in the past and had the editor just change the listing to reflect the new listing. You might want to write the editor in charge of that category and ask them.
Once your redirect is in place, go to the category and submit an update on the old listing and provide the new URL, that will probably expedite things and make it smoother. If you don't, eventually an automatic system process may unlist it, and it then waits for an editor to manually relist it with the new URL.
sorry bad choice of word. I think you knew that though.
"editor responsible for category in question"
I'd strongly disrecommend writing to "the editor" because the fundamental problem is -- you have no idea which editor it will be. Whether you write to "THE category OWNER", "THE editor responsible", or "THE editor in charge" doesn't matter -- none of them exist. And as for "the editor who will actually do the work" -- he exists, but we don't know who he will turn out to be.
So don't go that route--it's a dead end. Get the 301 in place, and suggest an "update listing". Updates are generally handled "fairly quickly" (by ODP time), and are most often handled by passing high-level editors out on sweeps, not by "category editors."