Mob switch for End main island

Me and my friends are planning a huge build on the main end-island (or rather, we've removed the entire main island to build something big).

We realised that we'll need a mob switch to stop endermen from spawning and griefing our build. What are the best ways to make a mob switch for the end dimension (and only the end dimension). We'd rather not have to use the main island gateways to load something, because we have plans for building around the gateways.

I was thinking a mob switch loaded by ender pearl stasis chambers (we are only 6 people on the server, so it's not difficult for all 6 of us to make stasis chambers). Would the best option be something with shulkers, bringing a bunch of wardens or something else?