I was afraid that was the only answer when sticking with keynote. Maybe for next year I can use different hardware/software. Do you know of any that could be built weeks ahead of time (including effects) and ready for use on site? That kind of removes the Viz from the conversation… I was thinking something else that has an alpha channel and can be built off site.
We have tried the luma key on black and most of the effects do not work well. Since we are tied down to some of these effects, at least for this year, I am working on making looping motion backdrops that come to a slow stop. This seems reasonable and looks pretty good… but not ideal. At least you can switch slides and there is not a visible shift and then the motion just starts up again.
Thank you for your response.