Using the Wacom rocker switch as Right and Middle mouse clicks pus the tap for left click is what I've been doing for 14 years. I agree Emile that the click drag is a stressor. I have been considering some kind of foot pedal for use as a modifier key. I'll have to look at the Elite.
Also, I never thought I would get any RSI from using a tablet but I feel some issues going on near my elbow. It took over a decade but I think using the stylus may have eventually caught up with me. Lately I'm using a mouse about 25-30% of the time to switch it up. I'm also considering a larger tablet to shift some of the movement to my shoulder instead of all wrist and elbow.