or maybe a mod that added say Nazi symbols or something.
You know there are WW2 games that have mods that do exactly this, right? Specifically because they don’t use Nazi imagery to refer to Nazi Germany because that imagery is illegal in Germany so they use substitute imagery that’s Germany-safe to represent Nazi Germany, because that’s cheaper than managing two editions where one is historically accurate and the other is Germany-friendly. For an example of this, see Hearts of Iron.
Then you get mods that restore the historically correct imagery.