(3) Any applicant seeking a certificate of registration as a professional structural engineer prior to January 1, 2021, who already holds a valid certificate of registration as a professional engineer from the board, has a record of practice which is primarily in the practice of structural engineering, and is currently engaged in the practice of structural engineering may submit a signed affidavit on a form prescribed by the board stating as much. Based upon such affidavit and any other means the board may deem necessary to determine verification of practice in the area of structural engineering by an applicant, the board shall grant a certificate of registration as a professional structural engineer. On or after January 1, 2021, no certificate of registration as a professional structural engineer shall be issued unless the requirements of paragraph (1) or (2) of this Code section and Code Section 43-15-16 have been satisfied."