(a) Except as provided in subdivision (b), the principal may limit the application of any provision of this division by an express statement in the power of attorney for health care or by providing an inconsistent rule in the power of attorney.
(b) A power of attorney for health care may not limit either the application of a statute specifically providing that it is not subject to limitation in the power of attorney or a statute concerning any of the following:
(1) Statements required to be included in a power of attorney.
(2) Operative dates of statutory enactments or amendments.
(3) Formalities for execution of a power of attorney for health care.
(4) Qualifications of witnesses.
(5) Qualifications of agents.
(6) Protection of third persons from liability.