Hmm..I'm totally unfamiliar with automatic shift levers in these cars, I dont think Ive ever even seen one. Im guessing there is a button on the side you push with your right hand thumb, and thats the more complicated second piece in your pics? And the first piece is just a snap on cover?
It looks like the second piece has some moving parts in it.
I dont think a copy out of aluminum will work, I think it needs to be redesigned in aluminum so that the mechanism makes sense and its as easy as possible to machine. Which is a good thing not bad!
I can make a curved surface with a ball mill with a nice finish.
I dont think I can do this project with out an entire lever assembly in hand (i.e. the parts you want to "bling" plus the rod they attach to, so I can redesign the whole thing)
If other people want this too, then it may be a project I can take on and sell for a reasonable price. Otherwise I'd have to charge you a couple hundred for one, because this would take several days to redesign and machine.
Unless you see a simpler solution? I'm looking at this through just your pics, I am not at all familiar with the parts. Tell me if there is an easier way!