I am not understanding why the projected resale price would be causing an issue. According to autotrader a low mileage, 3 year old version are on sale for almost the same price a new one!
Obviously the resale values of all vehicles is high at the moment. If we look three or five years into the future I don’t think there will be much demand for a 50kWh battery sized Berlingo or a diesel Grand Tourneo.