You may have mis-understood Mr. Kenyon, I knew Mr. Kenyon and it would have been very unusual for him to make a statement like "it's a C trigger".
Yes the trigger resembles or "looks" like a 52-C at first glance, but it's really quite different. I have attached some Photos of a 52-C trigger and a 52 Repro trigger, as you can see one of the critical things that's missing on the Repro trigger is the sear engagement adjustment screw, there just isn't any, and no easy way for a user to adjust for sear engagement, that's one of the critical things a trigger should have if the user wants a really good trigger. There are other internal parts that are not the same as a C trigger but you cant see them unless you take the trigger apart.
Same for the bolt, and bolt parts, they look like a 52 bolt but the parts are not interchangeable. Please don't forget, theses Repros were not made by Winchester, they were made by Miroku in Japan, they are Reproductions, not direct copies, so they are what they are. There are some parts that are the same such as the magazine that will work in both originals and repros but there's a lot of other things that are not even close.
BTW,
An original 52-C trigger will work just fine and bolt right on to the 52 Repro receiver but you cant use the Repro trigger attaching screw as the treads are not US, so if you are thinking of doing something like that and you don't already have a US trigger attaching screw you will need to get one.
Now I'm not saying that they cant be worked over into a very nice shooter, but if you expect them to perform like a sporter made by Winchester without some tinkering I don't think that's going to happen. I agree with you, you should have let Mr. Kenyon do a barrel job, and of course do the trigger work also.
52-Shooter