I don’t think an elytra kit is a good idea, since all the campers would choose it on certain maps. So we would see more extreme camping, longer games and it would overall lower the experience of playing Lucky Islands. Sure, campers can get hold of elytra even now, but they can’t count on getting one (which is great).
I have met too many players with elytra and grappling hook who simply run away and write in the chat: “kill yourself, I will never stop”.
Personally, I love using the elytra. I use it to rush people and do surprise attacks...