I suppose props would be available through the usual purveyors1), provided the producers made clear what the props were meant for. IIRC, freedom of the arts comes with some leeway regarding the use of verfassungsfeindliche Symbole.
1) Or the attic of that one great-uncle no one likes to talk about.
Fun fact: when Ribbentrop went to Moscow in August 1939 to
sell Stalin a crate of Henkell trocken sign the “German–Soviet Non-aggression Pact”, Soviet protocol had to use all the props Mosfilm was using at the time producing a big anti-fascistic film to give him a proper diplomatic reception.
Given what Ribbentrop was like, thoroughly appropriate.