I looked into this, and basically haven't found anything "lightweight" to do it. I'm using Inkscape in command line mode for the transformation, and you can also use it (using the -z command line parameter) on unixish operating systems, but if you're using Debian, I found that it still wants to pull in Glib, GTk2 and lots of other bloat. I found the recommentation of librsvg2, which also has a commandline SVG renderer, but it also wanted to pull in Glib and GTk2.

I'm not sure why you think that ImageMagick won't run in a shared environment though - ImageMagick will run well in a shared environment.