Actually, there are some plays they can use that feature more motion and interesting formations, to keep the defense off balance. The standard runs won't often work in the Red Zone due to all the congestion, unless a team has an offensive line that is DOMINATING the LOS. That's rarely the Cowboys lately, so McCarty needs to get a bit more creative, and Dak needs to get better at execution (more accurate passes, and better reads).
The O-line can't turn into something they are not simply because they're in the Red Zone. They are who they are. So help them out with creative play designs, even in the running game. Run out of formations that the defense hasn't seen before or something, or use the jet sweep motion and run behind it or hand it off to Turpin or Cooks on the jet sweep. Fake it to Lamb, and get it to Turpin on a screen on the backside. There's plenty they could do, which should be plays the defense hasn't seen before in the game.
