As far as I can tell this is not possible but I thought I'd check anyway to see if I'm mistaken.
I'm using SVG resource files for icons in my toolbar.

I would like to select a specific XML Element ID from the SVG for an icon, instead of the entire file. Just as QSvgGraphicsItem is able to use just a single Element ID for it's item.

(Having all the applications icons in a single file makes app wide edits much easier...)