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I mean that if you start the nexus, you'll need to have access to destroy it if the invasion mobs become overwhelming, or at lease allow them to end the contest. Automating the invasion is not likely a good idea.
Then make sure they don't get there. The whole point to invasion is to test your defenses. So test them and improve them.
Try making a reactor, an then use shafts to transfer the power to a few van de graafs around the nexus to slaughter any mobs that get through. Maybe make a shock panel field to further thin the herd.
You know what? Go ahead and create a flat world, and test whether there is a monster cap by encasing the nexus in bedrock, and not killing any mobs that arrive.
Uninsulated electricraft wires say they shock on contact, does that break the wire or anything? I remember back in the day using IC2 wires with high current as traps.