How to make a pseudo 3d object change sprites (animations) based on where the player is facing it

I am making a remake of Wolfenstein 3-D, and I am having difficulties making the enimies. I want to make the enemy have a fake rotation, where it is facing, and the actual rotation facing the camera.

I would also maybe like it to be a blend tree in the animator so I can add walk cycles etc. Maybe a parameter for what sprite should be facing?