So I've just managed to finish my Christmas present only a week late, but anyway, after 3 months of not hacking on anything else, I've finally released Swfdec 0.4 and its companion, Swfdec Mozilla 0.4.
The good news: The mozilla plugin is now almost 100% compatible with South Park Studio. So you can do this. (Yes, that's an SVG taken from the Flash)
Unfortunately there's no UI for it yet. Implementing Flash is kind of a huge task afterall.
Happy new year!