A 68-year-old man with known COPD presents to his GP with increased cough, purulent sputum and baseline wheeze for 3 days. Observations: temperature 37.8 °C, oxygen saturation 93% on air, no signs of pneumonia. He uses a LABA/LAMA inhaler regularly. Which combination of treatments is most appropriate to manage this moderate COPD exacerbation in the community?