It has been suggested elsewhere but now that we have more material maybe having another try for an edit where there is only one Death Star. It would mean swapping the ROTJ look for the Rogue One look. The attack in ANH only slowing down the construction so Yavin can be evacuated which is finally completed in ROTJ.
Idk, for me, that would detract too much from episode 4. The Empire has to suffer a great loss there, and Tarkin has to die. So, the only way that a single Death Star concept could work for me would be to have the Death Star explode only on one side (and maybe create a shot of Tarkin and his command blowing up, too) to sell the idea that despite a great success on behalf of the alliance, the rebels didn’t destroy the DS outright but merely destroy the main canon. Also, a larger explosion on the DS that consumes the main canon and a good chunk surrounding that area could easily explain the change in appearance compared to ROTJ.