he broccoleye isn't just MIL, that's for sure - I've met several people who say that.
I don't think I've ever heard anyone use that pronunciation. As for "pivet" for privet, I must say I've only heard people or things "pivot" or "pivotting" - never have I heard anyone despairing about trying to get the pivet out of their yard.
Although, I must say, teaching in the UK, I was often taken aback at various pronunciations, such as "tor-toy-see" and "por-poy-see" for tortoise and porpoise. Even simple word like "book" and "look" seemed to have at least two valid pronunciations. I just assumed it was a regional thing and thought, good, let's celebrate the difference.