You could do this by maybe turning the shows into a series of movies. You could do each crossover as its own movie, but then add in some scenes from other episodes to fill in backstory and round it all out.It would be really cool to keep switching from show to show, but there is a lot of stuff, so if you use the crossovers as the story focal point, you can get rid of anything not related to that story.For example I'm pretty sure the first cross over is Flash vs Arrow? so you can make that a story focal point, introduce both flash and arrow's origins in the beginning, leading up to the events of the crossover. And Crisis on infinite earths especially would be awesome edited down to a movie or two including some of the buildup from flash and arrow before that.
I have been looking around for a fan-edit of the Arrow flashbacks.
You could do this by maybe turning the shows into a series of movies. You could do each crossover as its own movie, but then add in some scenes from other episodes to fill in backstory and round it all out. It would be really cool to keep switching from show to show, but there is a lot of stuff, so if you use the crossovers as the story focal point, you can get rid of anything not related to that story. For example I'm pretty sure the first cross over is Flash vs Arrow? so you can make that a story focal point, introduce both flash and arrow's origins in the beginning, leading up to the events of the crossover. And Crisis on infinite earths especially would be awesome edited down to a movie or two including some of the buildup from flash and arrow before that.