i think a West Coastway route would be good. Of course, going from Brighton to Portsmouth HBR is long, but a route from Brighton to Littlehampton and Bognor Regis would be great. The class 377 is already in the game, and the upcomming Class 313 is also used on the West Coastway.
Yeah, if they done the ECW route then they can do the WCW as they have on all the assets needed, just have to build the route