Ideally we could communicate something worthy of the laughter of the child crowd, but if not we could resort to cutting the shot.
As usual it’s hard to imagine what to do here because I don’t know what will end up being possible for you guys. Luke hitting a home run and taking down a walker? Having a walker collapse in sync with lowering his hand? Kylo Ren’s pants falling down?
One thing that pops in my mind, which you or someone may have mentioned, that the “show” does not have to actually match what happened on crait. It’s hearing from somebody, who heard it from somebody, who heard it from somebody. It’s more about the legendary confrontation of the Jedi Master against an army.
So for the puppetry, it really can be mostly what we see, and basically have a “large puppet” that looks like a walker get’s hit by a flame thingy and falls down quickly. (If that is what already happens, than roast me since I don’t watch this movie much obviously)
Is that enough for the kids to laugh? Probably.
The other tough part to help it feel connected is even having the name “Skywalker” used to sound convincing from the alien … even during the time the children are laughing maybe?