You think Kagoshima-ben is bad? The current Japanese Extension HSC prescribed text is largely set in Yamagata, with a lot of characters speaking in Yamagata-ben! Both my students and I sometimes have fun trying to decipher what some of these characters are trying to say! Transcribing the prescribed extracts to give to my students (so that they can read the script for study at home) was fun... I made quite a few mistakes during some of the Yamagata-ben lines, which my students had a good laugh at (my mistakes more than the Yamagataben ). Off hand, I can't think of anyone I currently know who speaks Kagoshima-ben, but I might ask around at my daughter's Japanese school. It's interesting sometimes in class when kids start using their parents' own regional dialects in class and the teacher has to correct them in Hyoujungo... and parents are advised to be mindful to also explicitly teach their children Hyoujungo alongside their regional dialects to ensure consistency between home and class language. It's probably not as much of a problem for kids in Japan, but for Australian kids, their exposure to Japanese is much more limited and if the primary source of that exposure is a regional dialect, then obviously it will override their ability to learn Hyoujungo. It happens more with pre-school/Kindy aged kids -- most of them are used to switching to/using Hyoujungo by time they get to the K-1 class and above.

I actually met a lady who was originally from Shanghai but moved to Osaka over 20 years ago. Because she migrated to Japan as an adult, she learnt all of her Japanese as Osakaben and was utterly incapable of speaking Hyoujungo! She could understand it, but not speak it (Received Multilingualism). There would be a few times when I just couldn't understand what she was saying to me, and she would have to explain it to my wife in Chinese, who would then tell me in English, and I would then confirm it back in Hyoujungo! She actually ran this quaint little Ramen/Gyudon restaurant across the road from our hotel.