(a) Any person who has sufficient capacity to form a preference may at any time nominate any individual or entity to serve as his or her guardian or conservator. The nomination may be made in writing, by an oral request to the court, or may be proved by any other competent evidence. The designation of a representative under a valid medical power of attorney, a living will or of a surrogate decision-maker shall constitute competent evidence of the nomination of a guardian, and the designation of an attorney under a valid durable power of attorney shall constitute competent evidence of the nomination of a conservator.
(b) A guardian or conservator whose appointment has not been terminated or who has not been otherwise removed pursuant to the provisions of section four or section five of this article may nominate a successor guardian or conservator for consideration by the court. The nomination may appear in a will or other writing and shall contain a brief statement of the reason or reasons for the nomination.
(c) The court shall appoint the one so nominated if the nominee is otherwise eligible to act and would serve in the best interests of the alleged or adjudicated protected person.