How to draw a 'outline/wireframe' of specific edges/corners of mesh?

Hi folks,

I want to draw some specific lines/edges of some of my scene objects. The lines should be all in same size (screenspace). What would be the best solution for this?
A simple outline postprocess material wouldnt work because it renders only/also the outline. I tought about using the draw line command (HUD) and somehow get the information of the start/end positions for the lines from the specific models.

Here’s a mockup from what I want to achieve.

PP would be the way actually. Have you tried:

It seems to do exactly this…