Even if there was an official statement against it I have a strong feeling that NA / EU would not listen lol . . Just my thought on that.
If anything an official statement might just cause more drama / eyes on the matter, might be better to be like Blizzard with all their copyright infringement in the map systems they have xD (lots and lots).
As for the event it sounds wonderful and was a bit heartwarming to read, so I wish your mission a success :).