you could draw your shape and then save it as an image file. import the image file to SW with a high contrast and use the autotrace function then extrude.
I agree this could work, I never had to much luck with the auto trace functionality even with high res.
I was able to use auto trace to trace an image of Einstein and successfully extruded it. The only down side is that it seems to ignore parts of the image that are enclosed so Einstein is missing an eye
depending on your tastes try:-
hope this helps- have a good'n kelef
PS: no affiliations at all to anybody