I think some of the ANH:R graphics updates were a little excessive in the first place. They were made to make the film mesh more to the level of tech we see in the prequels, which aren’t part of Revisited anymore anyway. The new graphics and displays in ESB:R are a lot more subtle, and imo are better for it.
EDIT: as the Millennium Falcon is supposed to be an old hunk of junk, wouldn’t it make sense that the targeting displays are primitive looking?
As for the Death Star plans, why not have it start with the centered dish, then cycle through a few designs when R2 is plugged in, ending on the correct one.
Later, during the briefing, use the correct design but keep the slightly more primitive “look” of the graphics.