A 35-year-old man has recurrent episodes of wheeze and chest tightness triggered by exercise and viral URTIs. Spirometry shows FEV1/FVC 0.68 and an increase in FEV1 of 15% and 300 mL after inhaled bronchodilator. His symptoms occur twice per week, with no night-time awakenings. According to the Canadian Thoracic Society mild asthma guidance, which regimen is preferred?