no you see you dont have to use blender just the egg pipeline.
In order to use panda3d you have to have some one who knows how to use a 3d modeling app to produce eggs. In my case its blender, in your case it might be Maya, Max, C3d, Bruse … you name it. If you can export egg from it then you can make a theming system in it. Thats my idea behind this not create a new pipe line (tied to inkscape) but use the exiting egg pipeline.