Don't sign it. Don't carry it. Don't let JW family make health decisions for you. Lie, deceive, do what ya gotta, but just don't let this card/form in your life.
When I explained my situation to my doctor (family still in, me out) - that I would be pressured to refuse blood by my JW wife, he said, 'if your wife won't support you in a life saving procedure, maybe you need a new wife'. Not a great bedside manner, but it demonstrated just how insane this doctrine really is.
Another occasion during an emergency, the ER staff was prepping me for a possible blood transfusion, if things took a turn for the worse. A JW family member tried to intervene and play the blood ban card (not the literal card, just a metaphor). They were removed from the room, the ER head nurse said to me, 'you are the patient. You are of sound mind. Do you wish us to use every means at our disposal to help you? We will abide by your decision and will ignore any further input from family. Please decide now.'
I think most medical staffs are onto the WTS' tricks, and realize that most JWs are being coerced, either directly thru the HLC or JW family, and are finding ways to let the patient, when possible, make decisions on their own. Of course, this doesn't help children, or people unconscious (or people who signed a card when they shouldn't have), and will remain a life threatening issue with this religion as long as they hold to this murderous policy.