Wow. A broken plate!??
Unfortunately, a lot of gunsmiths nowadays don’t want to take on serious jobs like this (especially if it involves complex spring making), the rationale is that they put too much time into them and don’t make enough on the job given their time to fix the issue. If you do find a gunsmith that’s both competent and willing to take on the job, you’re literally a year or two waiting in line!! I know several very good, Classically trained extremely competent gunmakers and they simply will not take on any new clients or jobs their backlog is so big.
Give Reto Beuhler a call, he’s very good at complex jobs. https://www.customsportingarms.com/
This guy has made a lot of folks happyhttp://www.phillipsgunsmithing.com/contact-us.html
Steve Hutton is a British trained gunmaker, his specialty is a jobber and a machinist. try him
I doubt JJ Perodeau or Gunter Pfrommer will take on the job but you could try them too.
Del Whitman could hook you up, but you’re easily a year+ out.
Your guns have some serious issues. I hope you find someone to repair them.