Subliminal biases exist because they work. It’s simply an extension of the heuristic program that all intelligent animals use to survive; to eat the nutritious berry instead of the poisonous one. They can never be extinguished, the most one can do is drive people into a state of painful cognitive dissonance, as they try to reconcile the *belief* that the bias is unfounded, with their functioning senses, which tell them that it is working as intended.
To change the bias, you have to change the perception. To put a thinking human brain into conflict with reality is a crime against that thinking creature, and unsustainable. The only solution is to change the reality.