Notwithstanding any other provisions of this chapter, nonresident alien beneficiaries are entitled to the same benefits as citizens of the United States: Provided, That the commission, successor to the commission, other private carrier or self-insured employer, whichever is applicable, in its discretion may make, and the beneficiary shall accept, commutation of the benefits into a lump sum settlement and payment. Nonresident alien beneficiaries within the meaning of this section means persons not citizens of the United States residing outside of the territorial limits of the United States at the time of the injury with respect to which benefits are awarded.