What about this? https://www.emacswiki.org/emacs/Inkmacs
It's more for you, I don't really understand SVG editing through text, and even after reading, I don't really get what Inkmacs (or even XML editing) does.
Speaking of which: about my LateX comment, it was just a bad assumption about the way I thought you worked with SVG (which I know only through Inkscape, hence my complete ignorance).
