I used the Feelworld monitor with my Controllers, with 2000NITs it worked great. Mine is four years old, however, they do have newer models with higher resolution. This is the FW279 model.
If the Crack is near the battery than you have real issues, however if the crack is near a motor or on the arm, I would suggest you get the Phantom 4 Wet Suit which will protect it from Rain and keep it more secure an lock in the battery nice and...