I have to say honestly that I don't think anything can be done for that character. The guy could buy a new ffxiv copy and make a new toon. Sucks to start fresh, but even you admit he did what he did. While it was definitely nice of him to follow orders, those orders were done to investigate (innocent people would have had to obey those orders too). And it turned out he was guilty. I don't think SE is going to start unbanning people unless they are desperate for subscriptions.