Of course, just spitting ideas.
The shot for K2 is when Luke, Han, and Chewie are waiting for the elevator. You can see a bug-head 3PO droid walking by.
Yeah, that one would be IMPOSSIBLE, First I would need to rotoscope Han, Chewie, Luke as a separate layer.
Then remove the original droid THEN add in a 3D animated droid. If you can get me a droid animation I will try to do it.