I boought an aftermarket 109 decal set to get the swastikas.
Some manufacturers provide a "cut up" swastika on the decal sheet. Other provide a "cut up" and a full swastika in an easily cut off corner of the decal sheet. I know Eduard does this for sure, but I can't recall others right now. You could enjoy building one of those kits and use the extra for your Airfix kit.