A BUG-FIX IN BLENDER 2.8 HAS MADE THIS EASIER!!! Make sure that your version of Blender 2.8 was released on or after 3rd Jan 2019.
Rendering smoke with an alpha layer in Eevee is not straight forward – but it’s not that hard either. This tutorial assumes you’ve already made the smoke, and are now hunting for that elusive transparency.
The .blend files can be found here: https://www.blendswap.com/blends/view/93211
Note – 40% faster refers to the tutorial being 40% shorter – not counting intro and outro.