If everyone is looking for a set of unskirted cars then it's not likely that this set will be offered in Amtrak for the amount of orders that would be received. Just too much cost for such a low number of likely orders.
SCL Budd observations did run in the early day of Amtrak. The appeal to me of this set is that it's a way to get a small set of cars to fill in the gaps in my current Amtrak set such as the crew dorm and some variety on coaches and sleepers to balance my mostly PS smooth side fleet of GGD Amtrak cars.
Perhaps the alternative would be to request a set of cars from the Sunset Limited in Amtrak sans the RPO as they are all non-skirted cars and went into Amtrak Service.