It depends on what the objective, at it's core, needs to be.
If it's the history that's important, maybe it shouldn't be a game and should be something else instead.
If it's the game that's important, then move towards fictional settings where you can use a NatSoc stand-in faction to play the game, but maintain the underlying message that could then be over-lapped onto history by people who are paying attention.
Alternatively, you could do an end-around and make the game free and unpublished, but only available to people who are members of a program or club(this is what some Amish farmers are doing with raw milk).
It depends on what the objective, at it's core, needs to be.
If it's the history that's important, maybe it shouldn't be a game and should be something else instead.
If it's the game that's important, then move towards fictional settings where you can use a NatSoc stand-in faction to play the game, but maintain the underlying message that could then be over-lapped onto history by people who are paying attention.
Alternatively, you could do an end-around and make the game free and unpublished, but only available to people who are members of a program or club(this is what some Amish farmers are doing with raw milk).