Evidently my "So I think in the next year or so I might be in the market" turned into a month or so, and I found the Trico Clarion vacuum horns on Ebay too!. Now I have to figure out a safe way to do the radiator letters.
She is set up for touring, which works out well as my local club tours once a month:
https://photos.app.goo.gl/86yEVNcTcvheBuYr8
https://photos.app.goo.gl/N5GFArRbsFGo2n7G8
https://photos.app.goo.gl/GX4j1ggW4xKQphG77