I think chimley sounds quite nice. Is it something children say as it's easier than chimney and then the word stays with them).
I know a few people who say refuge when they mean refuse (as in refuse collectors)
is this a joke? Well, because the transition from M to N is hard for some people to get their tongues round. L to N can also be tricky, so if you're called Milne you may hear people pronounce it Millen.
Chimbley was quite common in the NW when I was growing up, my late Dad was also say 'ashphalt' for asphalt and 'prestinct' for precinct, would never be told he was wrong.