Off the top of my head: Village and Russian Railroads both have a relatively small number of single-value coins and would likely be a bit nicer with a fancy metal coin. Maybe also Tokaido (though I'm not sure the aesthetic would work) ?
Village could also use the sacks of wheat. Wheat and Pumpkins could go in Agricola, though there may not be enough of them?
Hey - nice spotting with Village. I actually own it but it has been so long since I have played it I had forgotten it used coins. They would be perfect.