Myles,
Did you realise that the U3A projector has a Video (AVI) input on the back. I can connect my Fujifilm H20EXR to it and show the content of the viewfinder on the screen.
Many users plug their cameras into the TV to view their picture, but if the camera you want to demonstrate using the common menu items on works like mine it would be very useful for our next meeting.
Has anyone tethered a camera to a computer to control shooting?