A 90-year-old man with a CFS of 7 is in a nursing home with advanced vascular dementia. He has been refusing food and fluids for 3 days and is not distressed. He has no advance decision but has previously told his family he 'never wanted to be a burden' and 'just wanted to be comfortable.' The nursing home requests the GP's advice on whether to insert a nasogastric tube. What is the MOST appropriate course of action?