I've been working on a PoB for a Lightning Conduit build that doesn't require using multiple skills. Just run through the map and press one button to kill packs.

This is achieved by using Choir of the Storm and having 100% crit chance on Lightning Conduit. In addition, when running into a new pack, they should be shocked by Lightning Bolt, which is triggered by Herald of Thunder having a high crit chance. Just in case we need a little more coverage, we can also use Fire Burst on hit with elemental proliferation to further spread shock every 1s. Make sure your cast speed doesn't go over 5 attacks per second or you'll cast faster than lightning bolt cools down.

In addition to all of this, because we want to keep HoT up, we use Storm Secret to re-trigger HoT even on bosses, and constantly deal a small amount of self damage that should be leeched back by ES leech.

Most of the gear is just life + resists, algor mortis can be used to sap (vortex on left click or use frostblink if you only need it for bosses) or you can use rare gloves with Crit against shocked enemies if you need to cap out crit chance and get more chaos res. The only required uniques are Choir of the Storm and Storm Secret.

With some tweaks to gear for more resists you could use annihilating light, and push the DPS into the 50M range by level 100.

Here's the PoB, let me know if anything looks like it won't work: https://pastebin.com/r5iSqbQU