I know this doesn't really answer the vector output for 3d problem for Mac users, but very simple eps extrusion and lathes and very simple 3d animation can be achieved with Adobe Dimension. Just add a little ingenuity and creativity and we Mac users just may be able to make it through until we get a vector 3d standalone. KPT's Vector effects program also has an excellent 3d extrusion/bevel capability (I've also figured out how to animate rotations from this plug-in).
Hope this is helpful to someone.