(Sorry if this has been brought up before on here - my thread searching fu is weak…)

This is probably less a radical change instead of just a noticeable one, but you could change the Death Star cannon color from green to red.

I can see why they wanted it to be a different color than the blasters to stand out more, but if you want to acknowledge the idea the Death Stars are powered by kyber crystals, then it’s not too much of a stretch to think of them as moon-sized Sith Lightsabers of Damoclese and therefore be red instead of green.

You might even be able to use that as another reason for Palpatine to be on the DS2; he’s the only Force user powerful enough to convert/bleed that large of an amount of kyber crystal to work for the laser.

And that might be more of a justification for Palpatine to keep building these things after they get blown up. Like Dr. Evil - “I want a friggin’ moon with a friggin’ lightsaber to strike down my enemies!”