For the purpose of granting consent or approval with regard to the acts or accounts of a personal representative or trustee, and for purposes of consenting to modification or termination of a trust or to deviation from its terms, the sole holder or all co-holders of a presently exercisable general power of appointment are deemed to act for beneficiaries to the extent their interests (as objects, takers in default, or otherwise) are subject to the power.
SDCL 29A-1-108