Which 3D software (MAC) can export basic or modified primitive wireframe objects as a vector? Example included

You can take a look at Blender using a couple of exporting add-ons:

https://docs.blender.org/manual/en/2.79/render/freestyle/export_svg.html

https://blender.stackexchange.com/questions/6675/can-blender-export-2d-curves-to-svg

I really don't want to learn any difficult software as from what you can see these are just basic primitives and imho should be exported easily

You need to learn some parts of the software or ask someone else to do it for you.

Is the program complex and can be challenging? Yes, but if you need to make a short film. But it is pretty simple when you have specific steps to follow, so follow some specific steps:

1. Install the program, add a primitive, and configure the parameters.
2. Install the add-ons
3. Export