I would not go for a trial run. I really would go into town halls and other places for simulations. I think one of the best ways of getting people who haven't really thought much about these alternatives to do so is to have simulations. It's the best way of teaching.
I've experienced this. When you stand up and tell people, even though you have very clear language, what STV or some other system is, it goes in one ear and out the other.