I'm not a legacy player. (Did play 1.0 but didn't stick with it.) I don't think they should even add it to cash shop, the whole point of legacy player bonuses is that they are a thank you to the players who supported the game from the start.
I also think that special event items should stay exclusive too, gives you something you can feel proud of owning if you made the event. Yeah shame for people who didn't get them but that's how it goes~