I saw a chance and took it: I was on the Sask-wide non-CBC local talk radio station talking about Saturn's new moons, and I created a burner email (thanks to suggestions from you all) and asked listeners to write to me if they had info. And because Saskatchewan is apparently one gigantic small town, IT WORKED!!
By the weekend, I had the phone number of the farmer who found the Starlink piece, and I got to chat with him.