Since the AZA only maintains Amur leopards, zoos in the US should just leave their leopards out of African areas. Instead, more exhibits like the Cleveland Metroparks Zoo’s Asian highlands would be nice to see.
Or, if a zoo is dead-set on including leopards in its African area, there are lots of hybrid leopards in private hands which may have some degree of African ancestry. I’m sure it wouldn’t be too hard to get a leopard from one of them, for something that at least looks more like Panthera pardus pardus than P. p. orientalis does.