Update:
No luck finding a shop locally, so I started powder coating the parts myself. Here's some parts in progress.
Grips
These are complete. The solo bare one is a spare for a custom color scheme
Shadow Trooper parts
Non complete
Masked parts, so far
I'll be posting an update every two weeks or so as I complete the process.
Shadow Troopers are going first, because there are less of them. I need to refine my technique.