Phil,
It's nice to know that they are out there...but he sure is proud of it!
I did find a source for what looks to be a replacement for the pivot stud that I might pursue if I don't come across a used setup.
https://www.ebay.com/itm/326255723757Now, if I could find a source for a reasonably priced bellcrank of the style you (Phil - Phak1) in your photo, I should be able to proceed.