You won't stop racism by being compliant to those employers who aren't racist.
I don't understand this point.

My point is that those employers who aren't racist are not the problem. It's those who are racist who need to have their eyes opened as to the folly of their biassed mindsets.
If you are black, and a good teacher, you can sometimes work for an employer who is racist, and most likely make him non-racist,if he is sb who takes education seriously. By not providing a photograph unless you are asked for one, can get you into the lion's den, as it were. Once in, you can prove your worth, and thus change your employer's attitude to black teachers in a positive way.