Maybe try tumbling the parts? That would give a more rounded edges and more similar appearance to the original and give you more flexibility to make them by CNC. I would think if you also change your 3d model to have more domed panels you can get much closer as well.
My personal opinion is that a lower cost is more important than duplicating the production process. Which ever process can be done at a lower price, at the quantity you see demand for, if the parts look the same from 1 meter away and the function the same I wouldn't care how it was made.