In Japan you generally address someone by their title (ie, "Kacho") as the first choice, their last name (ie, "Suzuki-san") as the second choice and almost never by their first name unless you know them fairly well, or for children. That doesn't really has much to do with respect, it's just the custom.
Actually, in spoken Japanese I've found that people are often much more informal when speaking about important instructors and historical figures in Aikido than their counterparts outside of Japan usually are.
In any case, most of us are not in Japan, are not Japanese, and do not even speak Japanese. I don't have much of a problem with anybody calling me whatever.
Hope you are comfortable with your new adopted foremame.
Why not add the phrase will be will be to whatever and then change the new name to Que Sera Sera?All your class members could then start a sing a long in the dojo each time they engage with you in conversation.Cheers, Joe.