It would have to be a VFX replacement of one of the two (or both) super brief shots right before the vat of Palpatine clones. It could probably actually be a static image, given that the camera doesn’t move around at all.

The problem with the first shot is that one of the Sith goons is walking around right in front of the camera, obscuring the machinery. So maybe it would just have to be the second one, replacing the right side of the screen with the hand vat for those two seconds. But at that point it’s a “blink and you’ll miss it” moment. Which would probably be for the best if I don’t pursue the lightsaber bit.