Just leave the area blank if you decide to not have a swastika.
All other images placed on the vertical stab only serve to highlight that something else was there, what it really was, and what it means.
I'm all for a modeler applying a swastika to a model he builds for himself or one to be placed in an area when where can correct context of the marking can be given.
The 109 restorations you show are a bit of a gray area for me since they are kept at a museum where visitors can be given that context. But since the planes do indeed fly, omitting the swastikas is also appropriate. If they were only for static display, I'd be in favor of the swastika being applied.
When it comes to games, I fully support a developer's decision to not allow swastikas. Without context, people will assume the worst the moment they see a swastika because that symbol is still used to this day as a symbol of hate and oppression. Adequate context is difficult to provide in a single player game and near impossible in a multiplayer one, especially for casual observers.
