In my state registrants are required by law to maintain a valid ID, and failure to comply with the registry laws is a four year felony for each count. The state will make back any financial loses plus change from refusals to renew IDs when they prosecute those doing the refusing. Judges across the state will have no problem issuing arrest warrants for any number of non-compliant registrants.
A protest like you suggested might raise a few eyebrows, but in the end all it will result in is more registrants behind bars where they can’t do anything for our cause. Our fight is in the courts on Constitutional grounds.
Remember, protests are great for bringing attention to an issue, and I am all for them. However, it really boils down to what is Constitutional and what isn’t. The court’s opinion is based on it’s findings of the constitutionality of the law, not on how mad the public is.