I'm looking for a Minecraft plug-in that will teleport you back to the spawn if you fall off a lobby island?

I'm looking for a Minecraft plugin with which you can set that if you fall off the lobby island you don't have to wait until you die and then respawn, but that if you fall you instantly teleport back to the spawn!

I can't think of any, but such a plugin is so extremely easy to program yourself that I think you can even learn it yourself

I think that is even possible with a / execute command, so it's really easy.