Okla. Stat. tit. 84 § 305
A policy of life insurance may designate as beneficiary a trustee or trustees named by will, if the designation is made in accordance with the provisions of the policy and the requirements of the insurance company. The trustee or trustees may be appointed immediately after the proving of the will, and, upon appointment and qualification, proceeds of such insurance shall be paid to the trustee or trustees to be held and disposed of under the terms of the will as they exist as of the date of the death of the testator and in the same manner as other testamentary trusts are administered; but if no qualified trustee makes claim to the proceeds from the insurance company within twelve (12) months after the death of the insured, or if satisfactory evidence is furnished to the insurance company within such twelve-month period showing that there is or will be no trustee to receive the proceeds, payment shall be made by the insurance company to the executors, administrators or assigns of the insured, unless otherwise provided by agreement with the insurance company during the lifetime of the insured.
Okla. Stat. tit. 84, § 305