This is probably a long way down the road tho, and won’t help you much here. One way in which you can offset a path in Inkscape is by using the Dynamic Offset tool. There has been much talk recently on improving blender’s NURBS functionality, including trying to implement data transfer to/from other apps via openNURBS format. STL is likely your best format to attempt, but yes, it will only come thru as vectors & faces (polygonal surfaces), not much else. Sorry… back on topic: Getting blender geometry cleanly into a CAD application has always been troublesome. I design a lot of aluminum castings where I work now, and maybe less than 1% of the geometry that I create needs to make use of surfacing tools (in CATIA V5.) Industrial Designers (in consumer-product design, especially) make far more use of NURBS-based data structures than your average CAD designer or engineer. Compare price, features, and reviews of the software side-by-side to make the best choice. Actually its more used to describe advanced surfacing geometry - which has little to do with probably 90% of what CAD is used for. Rhino, like most CAD apps, handles most kinds of geometrical descriptive methodologies, not just NURBS exclusively (which is just one of many ways to digitally describe geometry.) This whole CAD=NURBS mentality is a tad skewed. For instance, on this page you can find Inkscape’s overall score of 9.1 and compare it against Blender’s score of 8.

Rhino is a nurbs modeller, it works with nurbs, blender is vertex. You’d have to set up your camera to be orthographic, etc., but it can be done, I think. IIRC, there are scripts which allow blender to render to SVG, not export.

Blender and inkscape software