A cool idea to archive these—the art is really sweet! I remember seeing a Japanese Neo Genesis/Gold, Silver, to a New World storefront poster on Ebay before and thought it looked neat. I don’t know if these are in the right price range or if you’re looking to pick any up right now, but I see a Neo Revelations/Awakening Legends one and a Neo Destiny/Darkness, and to Light one up on Ebay (US).
A member here (@shizzlemetimbers) also has the poster for Neo Discovery/Crossing the Ruins posted for sale (for quite a pretty penny though). If you just want the scan for archiving sake, maybe you can reach out? He also has a thread with a pretty good picture of the Base Set poster (will post below)—not sure if it’s actually his or not.
Also just found this old E4 thread with storefront posters for the first three sets. They look pretty sweet! But I’m sure they’re incredibly hard to find these days.