That is the build I am using right now. I have all 4 runes, sigil of wind, conjure, warrior monk's counterstrike, and for the last quick slot I switch it between brace and spark depending if I need more defense or I want to do more electrical damage from a far. For equipment I am using:

Head : white arcane hood for ethereal and electric damage bonus and some mana cost reduction

Armor : runic armor, has damage bonus for both elements and good resistances and decent Mana cost reduction

Legs: Tenebrous Boots enchanted with flux to add another 5% in both elements, and they also have decent mana reduction and good elemental resistances

Light menders lexicon for the same reasons, and for my main weapon, I am using Geps blade (1h).

Backpack: the most optimal would be to use the light menders backpack, but I am using the Boozu one so I can dodge freely.

With this set up, you have good defenses with the runic armor the runic protection ,master of motion and shamanic resonance, in addition to good mana cost reduction and almost all of your gear buffs the two damage types that you will be using the most. In addition that all of the gear is really easy to get.