A 58-year-old man is seen in a family practice clinic for follow-up of elevated blood pressure. He has no diabetes, chronic kidney disease or cardiovascular disease. His 10-year global cardiovascular risk is calculated at 16%. Standardised automated office readings on three separate visits are 152/94 mm Hg, 148/92 mm Hg and 150/96 mm Hg. He is a non-smoker and has already implemented dietary sodium restriction and increased physical activity for 3 months without significant change in blood pressure. According to current Hypertension Canada recommendations for primary care, what is the most appropriate initial pharmacologic approach?