True, but the “happy” ending to The Great Silence doesn’t look like it had much effort put into it. I’d say the same about “happy” ending to Minnesota Clay except for that iconic shot of the glasses which shows at least some effort on Corbucci’s part. Maybe Corbucci wasn’t quite as cynical at this point so was more amenable to this “producer’s idea” as you say.
When I get a chance, I’ll take a look through some of my Corbucci interviews to see if he ever spoke about it.