I hope I understand your target correctly. Two ideas about it:
The file “…_REre_01.c4d” shows how to render the Platonic as a Render Region, but you need to increase the overall Render Resolution. Render only a single image. This can be now animated in AfterEffects. Move and scale. Since no perspective change is wanted.
Another way is shown in file “…_ANts_01.c4d”, where the perspective will be kept from the set up. No object nor camera move is involved, so the perspective representation of the platonic will be the same. This is done by just changing three parameters, the focal length and the two offset values. As with any “Zoom” move like this, we get no difference in the perspective, which is common knowledge, and why a good cinematographer uses a dolly and not a zoom. The shift lens effect, aka offset moved only the “sensor” to the side, also without any change of perspective representation. What is normally avoided, leads here to the effect you are after. If I got your request correctly.
If you like to have the platonic at the position of the cube, you have to place the camera and the platonic under a null and move both. The platonic will be small in the scene, but not in the rendering. If you need to scale the platonic up the camera must keep the focal length, but move back. Have a look at “…_ANts_11.c4d” The Parent Null holds it all, except for the camera parameter, focal length and offset.
If you need something else, and I got your idea about it wrong, let me know.