How about the Milwaukee Road's Hiawatha of 1934? From the research I've done, here on the Forum, Weaver's is the only accurate representation available but was released many years ago. When they appear on eBay, they go fast and they go high, proving that there is a market out there for fine models. Perhaps GGD would be interested, if Atlas/Lionel/MTH are not?
Everybody and their brother offers some version of Hiawatha locomotives, take your pick.