Kala Dungar is a hill, not a desert floor. The point of coming is the view: a drop to the Great Rann, especially when the light is low. There is a small temple and a well-used viewpoint. The road up is part of the day.
India Bridge and the Road to Heaven sit in the same northern country. Read them as one scenic day: Kala Dungar, India Bridge & Road to Heaven.
Carry a wind layer. Confirm any restricted stretches before you leave Bhuj.