The interest in the Road hole at TOC, imo, is mostly about the approach and trying to get the ball onto or just short of the green. The tee shot is worrisome but having to play around the road hole bunker, or going in, is mostly my worry. Road hole bunker can easily take two to get out.
The wall is interesting and yes, I have found it necessary to bounce the ball off the wall towards the green.
From the fairway or rough, the wall actually helps me feel safe. I have seen a few bounce off and away, versus the bothersome one to three feet away. Shots from the road are interesting but not fearsome.
An interesting imitation should have a bothersome bunker placed around the green imo, with sort of the same angles as the TOC. Looks like Yeamans has that although I can not remember the slope of the green or ground coming into the green.
The addition of a wall or road would just be extra and not critical in my view. Seems Raynor mostly used a green side bunker cut at an angle to the play, for the aspect of the road hazard.