The settlor of any trust affected by this chapter may, by provision in the instrument creating the trust if the trust was created by a writing, or by oral statement to the trustee at the time of the creation of the trust if the trust was created orally, or by an amendment of the trust if the settlor reserved the power to amend the trust, relieve his trustee from any or all of the duties, restrictions, and liabilities which would otherwise be imposed upon him by this chapter; or alter or deny to his trustee any or all of the privileges and powers conferred upon the trustee by this chapter; or add duties, restrictions, liabilities, privileges, or powers, to those imposed or granted by this chapter; but no act of the settlor shall relieve a trustee from the duties, restrictions, and liabilities imposed upon him by sections 1093–1095 of this title.