I'm wondering something along those lines myself. I'm making a care plan for a 93 y.o. demented patient who stopped taking her meds, stopped eating, drinks very little, and rips out anything you stick in her - IV twice and Foley 3 times. Everyone figures she just wants to go - family signed a DNR, no feeding tube.
So NANDA 1 is Self-care deficit: feeding. Interventions are mouth and neck assessment, request for bedside swallowing evaluation, attempted feeding, experimentation with textures, tastes, finger food, sippy cup, nutrition supplements, hourly offer of water, etc.
and NANDA 2 is something to care for her as she dies as she most likely will. There's Impaired Comfort but so far she's only Risk for Impaired Comfort which is not a NANDA - coping, grieving, spiritual distress, denial just don't apply with her cognitive level, same as your patient. She should have eye, oral and skin care, comfortable positioning, a hand to hold which she likes, maybe music, IM or patch meds PRN for pain, air hunger, anxiety - and it should be planned for in advance whether she's in hospital, hospice or back home.
If your patient's mental status isn't likely to change soon, what about a Family Coping NANDA, or Impaired Social Interaction?