The answer is to use HTML5 canvas instead of SVG, and create your icons as a JavaScript algorithm. Canvas code can become vector if you utilize the scale() function. I've done this for the icons in one of my web apps and it's a superb solution.

If there was some way to export a vector drawing as a JavaScript algorithm, or some semi-standard way to process an SVG image to Canvas then it'll become the defacto icon solution for the forseeable future.