Isn't that a bit too OP? I mean I don't really play eggwars so I don't know much about the kits, but changing them mid-game is quite OP
Example:
I start with the kit "Eggshell" (I think it gives me 8 diorite blocks)
Then I place them and do /kit
I choose another kit (if there is one, the speed kit)
And then wait untill I get my kit items again.
So I don't really like the idea