The department may promulgate rules and regulations to implement the provisions of sections 208.900 to 208.927. Any rule or portion of a rule, as that term is defined in section 536.010, that is created under the authority delegated in this section shall become effective only if it complies with and is subject to all of the provisions of chapter 536 and, if applicable, section 536.028. Any provisions of the existing rules regarding the personal care assistance program promulgated by the department of elementary and secondary education in title 5, code of state regulations, division 90, chapter 7, which are inconsistent with the provisions of sections 208.900 to 208.927 are void and of no force and effect.