A powerholder of a presently exercisable power of appointment may contract: (1) not to exercise the power; or (2) to exercise the power if the contract when made does not confer a benefit on an impermissible appointee.
Power To Contract -- Presently Exercisable Power Of Appointment
Mont. Code Ann. § 72-7-405, under Disclaimer on Release -- Contract to Appoint or Not to Appoint.
Mont. Code Ann. § 72-7-405