Go to an anime con. You'll fit right in, people will accept it without thinking and you can scram before anyone realizes what's happening.
Or go to festivals and open a stall, offering to turn them into magical girls.
People will just think they are jokes.
There is another option, which is less disturbing then tricking people into being forced to become battle mages without them realizing it (and possibly changing gender against their will. Homophobes would really be disturbed by this.)
If it helps cure sicknesses, then go to hospitals for terminally ill people who still hold onto hope.
It stops aging? Do you realize how many people would sign up just for that.
Full gender swaps? Offer it in the TG community; they would rush as a mob!