... he gave me the whole, "I can't tell you because you're not in the religion" act.
I'm curious, too!
I certainly never heard this word in a religious context, if at all. I am only Omoanyá and Iyawó-Obatala with little practical experience, but I have been building my theoretical knowledge progressively since 1981 and have my main connection with the religion through a house of Ifá in Cuba; so I really wonder what kind of super-secret ritual detail the word "changüiri" could refer to ...
Perhaps I ask my padrino if he knows the word, so I'll see how much secrecy there is to it.
TA