I don’t know much about fan edits of the Prequels, but I’d suggest the Clone Wars cartoon. It’s on Netflix (in America at least) and it’s great for kids, and as the series progresses, it’s quite good for adults.
Yeah, i would certainly recommend this as well as rebels
For sure, but definitely start with The Clone Wars, as it sets up some big stuff in Rebels.
I would probably suggest going with an official release of the Prequels, as well, considering there’s so much work to do to “save” them, a lot of stuff is likely cut out or edited heavily which would result in something that might be confusing for the kiddies.