@UKHeliBob Not really, as they need the slide projector to keep running (forward) for an exhibition.
However they told me that they will want to reuse it, so it might be a good idea to have both directions plugged into the Arduino. Once I do the mod, they will loose the ability to use the remote and so loose the control over the projector.
In short, If I can make a breadboard with two buttons to replicate what the remote does, it would help.