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Sometimes I am accused of going overboard, but original nyloc nut and steel washer used for ball joints, etc. on certain vehicles vs. Cartridge 12 point, plated aerospace lock nut and shaped titanium washer. OK, maybe a bit overboard but safety and weight count and unless one's mindset thinks weight and safety in every detail the war to achieve the minimum of the former and the maximum of the latter is lost.
I don't know that the coating on threads could remain intact once fastened. We run across this often using dissimilar metals in orthopedic implants. It may be a non-issue, but such corrosion can lead not only to stuck or fused nut/bolt interfaces but also a source of a microfracture/failure. Frayed may more insight on this as well - I think metallurgy was part of his background.
Regardless, you sure have access to some cool stuff!