Reversing the player's controls

I'm working on a mod and I want to reverse the player's controls but what I am doing doesn't seem to be working.

public static void movementInputUpdate(MovementInputUpdateEvent event){
        Player player = Minecraft.getInstance().player;
        if(Minecraft.getInstance().player.isAlive()) {
            if(chaosActs.hasAct("reverse_controls")){
                
                boolean up = event.getInput().up;
                boolean down = event.getInput().down;
                boolean left = event.getInput().left;
                boolean right = event.getInput().right;

                event.getInput().up = down;
                event.getInput().down = up;
                event.getInput().left = right;
                event.getInput().right = left;

However previously in this mod I had an effect that forced the player to crouch

event.getInput().shiftKeyDown = true;

And when I even placed it inside of the first chunk of code and it worked fine.

Is there something I am doing wrong? is there a better way to invert the player's controls?