Source Replacer / Swapper

Okay so this HAS to be a solved issue, but I am usure of what tool I should use for this. As you can see in the image, I have a spot in this example layout where there is space for a source on screen, which gets switched out with other similarly-sized sources every so often. What I want is a system for replacing the source and swapping it out with one of the others. I have used the source toggler lua script in the past, I think, but this does not take into account priority, and is pretty limited. I would want to have capabilities for a priority tree/queue (for example if a raid comes in, that would override every other source). Also having groups be on a timer would ideal. I think there are tools for this with the Move plugin, there was something called Transition Overrides that might do this? I don't know. Maybe using Advance Scene Switcher within a nested scene? Does that work within nested scenes?