The Death Star test is actually a pretty interesting proof of concept. Having two rings instead of just one makes the explosion a lot more grand. I agree with Darth Lucas as well. I think the way the Death Star II explodes is kind of like that; it glows a little bit then blows up completely.

Speaking of your 3D model problems, do you think making an actual model could work too? I have access to a green screen so I could film it possibly. I’d have to learn how to make a decent model though. Not sure which would be more work. You also run into the problem of not only making a Death Star model (whether it be real or CG) but also having to make it break into pieces in a way that is similar to the Death Star II, if you want imply they are the same station.

I understand this may be rather difficult to accomplish so I am behind any other ideas we can invest in that might actually benefit the story more.