Comment by Theodores

Have you tried the Jetbrains tools? The free one - WebStorm - comes with live preview.

Nowadays I put my SVG for icons in CSS as pseudocode elements. This means you can't 'use' or 'currentColor', but I am okay with that for icons.

https://en.wikipedia.org/wiki/Lea_Verou

Lea Verou got me started on this particular technique, the gotcha is that you have to escape the hash characters with %023. Her presentations can be found on Youtube, and Lea also has a fab website.