In a comment on my previous post, Stephen suggests:
Have you considered “upgrading” to a flannelgraph? (iFlannel?) Then all these technical problems would just fade away. Mostly you'd have manually fake dissolves and fades, and keep swapping the lyrics etc.
Maybe the physical activity could double as some sort of liturgical dance.
Unfortunately the idea of seeing me doing a liturgical dance has caused strong men to lose their lunches, particularly after seeing my “Village People” turn...
'Nuff said?