This may be an extreme option...but, there are several restoration people on YouTube who do all kinds of incredible restorations on old toys, machines, etc. It might be possible to contact one or two of them to see if they can help or at least point you in a better direction for getting something done on a small scale.
I know there are people who can take an object and make a 3D printed copy of it and then take that and use it for making a mold...and then using that mold to cast an entirely new object.
Like I say...it's probably going to an extreme...but, hey, who knows?
[ame="https://www.youtube.com/watch?v=iA_Dty-sZ7s"]Restoration extreme rusty abandoned 1931´s car truck - YouTube[/ame]