Are there no machine/welding shops in your area? Seems like something a decent machine shop would be able to do. It's been 30 years since I had any involvement spray welding. What I recall was the surface had to be prepped (roughed up) and then pre-heated to a minimum temperature. A temp stick was used to know when it was hot enough. Then the powder was applied until a sufficient amount was applied. As I recall there was more than one powder compound but I'm not certain. I linked a company in NY that looks quite capable of doing the work you need.

https://altamontspraywelding.com/