I'm sure featureitis was the precursor for the Tower of Babel. Even the best design and implementation can melt down under that kind of pressure.
My suggestion would be for you to add a single field that could then be repeatedly filled from their spreadsheet containing your comma delimited data and the hundred or so additional column these type have a crying need for. Let them do it on their own dime. They can just keep reimporting that field until they get as confusing as the code changes they cry for.
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