I fail to see how a dummy load and a SWR meter will help to make sure you don't disturb other (portions of) RF band(s). To assess this you must look into the spectral purity of your signal. You do this with a spectrum analyzer (or equivalent). The SA is already 50 Ohms terminated so you at most need attenuators for your transmitter. The SWR meter will tell you if your transmitter is matched to your antenna. If not you might kill the final stage of your transmitter. SWR doesn't tell you something about radiating unwanted frequencies.