I can put you in touch with the company in the UK that does this
They will not do a one off but if you have 10 to do they will take on the job
you will also have to pay for tooling to hold the component part whilst the conversion takes place for my 6 hole rotor and chainring tools this was 220quid for the cassettes it was 350 quid as they have a bigger mass if you consider the testing we have had to do and design changes the tooling cost soon add up its not quite as simple as holding the part It will change as the process applies
Also the companies in question will not guarantee your coating if its not a substrate they can confirm the metallurgy of.
I have already just done this on brake parts and drive train parts I’m working on.If this is for wear resistance there are 3 companies that provide the same coating and some others which are slightly harder wearing but more costly