How much longer do you think this ride has left in service life? 20 years old, launch coaster and some strong track stress points. If it has about 10 years left, I don't see them investing much. If they plan on long term ride life, it would be awesome to see them invest in an idea such as yours. Reskin the cars, remove or dress up the Conex containers, landscape heavily and remove the junkyard theme.
They could theme each train with those colors as a nod, what other Cincinnati/NKY easter eggs could they throw in?