Sure, but I don't think they insult Ceric's intelligence enough. I should add neon and glitter and lots of arrows and signs everywhere. Have cute little mascot characters portraying the correct action. Hell, I don't know, hire people to walk him through the motions.
If possible, I'd add a video screen to each door with really slow scrolling text and lots of random noises and bright colors to hold your attention where you have to press a button after every sentence and watch the whole thing to open each door.
"Hey! Ceric! Hey! PAY ATTENTION, this is important. (Press button to continue.)
How to turn this doorknob: (Press button to continue.)
Extend your arm by straightening your elbow. (Press button to continue.)
Fun fact: did you know this is only possible because of the muscles and tendons in your arm? (Press button to continue.)
If your hand is closed, open it by uncurling your fingers. (Press button to continue.)
Raise your arm in the direction of the door. (Press button to continue.)
Keep your arm raised. (Press button to continue.)
Maneuver arm and body if needed so that your palm touches the doorknob. (Press button to continue.)
Hint: The doorknob is a protrusion that can easily be used to open doors. Look for it at the right or left side of the door. (Press button to continue.)
Be strong! You're almost there, Ceric! (Press button to continue.)
Close your hand, curling your fingers around the doorknob. (Press button to continue.)
Turn your hand at the wrist (where your hand ends and joins the rest of your arm) in the direction of the Bright Green arrow. (Press button to continue.)
Keeping your hand at that angle, step forward. (Press button to continue.)
While stepping forward, push the door gently. (Press button to continue.)
Walk through the doorway. (Press button to continue.)
Proceed to "closing door" video on the other side of the door. (Press button to continue.)"
"Hey! Ceric! Hey! I'm on the other side of this door! (Press button to continue.)"
etc.
Of course, this raises the question of how he would press the button while using his arm. I would probably have to teach him how to use both arms at the same time first. Or maybe use voice recognition instead, so he just says "Okay!" to go on.
"You don't sound cheerful, Ceric. Is something wrong?"
I'm done.