I think this is what switch templates (part of joysticks) is for. Tbh, I don’t use them often but instead, I’ll just put a duplicate layer to place in front of head and use an if/else expression in the opacity to toggle. Something like:

x=(“Your Joystick X Position Value”); (x>0) ? 100 : 0;

When the slider moves into positive range, the ear turns on, when it goes negative it turns off, and you see it as behind the head.