The front plastics and such hurt the approach angle, which is why a lot of the aftermarket bumpers you see tuck up really close to the front of the frame and body to try and improve that aspect. Most of them also don't cover much of the front of the wheels so you can get them up and over obstacles without ripping through the bumper to get there
I haven't seen one that covers the same amount of area as the stock bumper, but you could probably have something custom made.