A 76-year-old man with longstanding type 2 diabetes, mild cognitive impairment and multiple comorbidities (ischaemic heart disease, CKD stage 3b) lives in a long-term care facility. His current HbA1c is 7.0% (53 mmol/mol), and he has had two episodes of symptomatic hypoglycaemia in the past 3 months. According to Diabetes Canada glycaemic target recommendations, what is the most appropriate HbA1c target for him?