This mockup doesn't quite illustrate the idea I have in mind but what if instead of having the Rebels fight their way down after getting through the backdoor they fought their way through and up so they came out next to (or more ideally under) the dish.

Then the explosives could just knock the dish out (a falling dish could look more arresting than a giant explosion, the film has enough of those already).

Lucas seems obsessed with blowing up reactors when just snapping the dish would get the job done.

I used Angel's elements for this mockup which I hope get's the general idea across.