PoB: https://pastebin.com/g6ZJrkqn

There are notes inside, and a few different gear and tree setups for budget and progression.

Basic idea:

1. Convert EK to fire, cold and lightning.
2. Use an Alternating Scepter heist base for Secrets of Suffering to inflict scorch, brittle and sapped.
3. Play Raider for speed, elemental exposure and easy spell suppression.
4. Use Sniper's Mark. Use flesh/flame jewels to get Focal Point from Deadeye.
5. Tornado on a trigger scepter.

I've had a lot of fun with the build and I'll probably keep playing it for a while longer.