The Supreme Court doesn’t have the power or the need to rewrite the form. Either the Executive rewrites the form to comply with this ruling, Congress passes a law ordering the Executive to rewrite the form, or someone answers the form truthfully, gets denied, and then sues the ATF. Depending on how the case is filed and relevant case law, the court can order the ATF to issue a permit to the plaintiff, or order the ATF to stop denying permits to anyone who is in a similar situation to the plaintiff. (The recent rulings about nationwide injunctions are directly relevant to this discussion.)