Convert LineRenderer SetPosition from World to Object Space

I currently have a LineRenderer that renders my line perfectly when I have use world space enabled.

However, I have determined I need to disable use World Space so that when the object moves the line appears in the same place relative to the object.

Is there a convenient way to modify my SetPosition call (which currently uses world space locations) to set the correct locations when world space is disabled? I am assuming I can subtract the object coordinates or something, similar but it seems that the scale of my Line Renderer line is huge when I disable setWorldSpace.

Is there a convenient way of doing this or should I rewrite my SetPosition call from scratch?

Thanks!