Did you find a powder coating powder that would match or just go with a generic black, grey or silver? I've been powder coating bullets for years and have been considering doing some fasteners and other small parts. I could also hot blue which might look pretty cool against the orange and blue/grey.
Bullets? Really? How cool - I'd like to see pics of those.
I wasn't worried about trying to match the Kubota colors exactly. I used Squirrel Grey Powder for front axle hubs, front grill and all linkages such as accelerator and brakes. That is a good enough match with Rustoleum Smoke Grey that I used on the front axle, frame, rops, etc.
I used black powder on seat mechanism and some engine area parts - pump shafts, mounts, piping, etc. I even used some chrome on springs just for fun!
As the project progressed, I began using zinc rich primer and hot flocked the grey - now that was an excellent thing to do!
As you know the prep work for powdering is the most critical. I clean and bake parts a long time before coating. I learned about failure not doing enough cleaning!
Your description of 40 miles to the nearest store makes me think you're on one of those gigantic farms on the Pamlico. I love riding motorcycle out there.