Ok actually maybe just having a smoother gradient at the edges is enough?
vs these, this one is just using some extra features from Inkscape (object blur and blending style) and the innate noisiness of the fade shader does enough to roughen up all the edges.
Still technically a bit more effort than just straight importing the SVG, but not like. that much. I didn't even need to open the exported PNG in another program or anything, that's fine.