If they press you into responding ask:
"Can I fulfill all of my scriptural obligations without signing the form? If not, which scriptural obligations are affected, and why?"
"In the instructions you received for getting people to sign this form, does it say that you must not pressure people to sign it? That being so, if I refuse to sign it, should that be the end of the matter?"
"If you wish to speak to me about my refusal to sign the form, would you object if I recorded the discussion?"