It seems every time a SPAD 13 comes out, we see Rickenbacker, Luke, Barracca, and Turrenne.
As the Cockades are the largest decals, I would lean towards national boxings: i.e. USAS, with 94, 95, 27 PS options among others, French 'Storks' which would include Foncke and Guynemer, non-Storks boxing, RFC boxing, etc. Keep in mind, this has to be boxed with the correct parts, such as wingtips, panel options etc. If Roden needs to reach out to SPAD experts and restorers, they should and follow some of the tricks use to allow for updates to be used seamlessly.
Leave room for the decal makers too!