From OP question, sensitivity about revs used with these should be no concern at all. They're properly designed to perform, without detrimental effect, right up to the red line. Change at whichever rpm you need to use in acceleration is the right way, I've always used engines to full range unless there's a very good reason not to do that.
Ultimately the biggest influence on wear is poor oil condition, usually fuel diluted even if changed at correct mileage that is the primary cause of excess wear on all engines. Short runs and much choke will do far more damage than any revs will account for.
Changing gear, with throttles well adjusted etc, chain slack adjusted, and through normal acceleration/deceleration I never use the clutch. Its always smooth up or down with throttle blip to match speeds. Dog gear engagement (all bikes really) it makes no difference if you use the clutch or not to the action of gear selection assuming speed matched.
Slow traffic, around town etc I'll use the clutch to modulate as there's often not space to use consistency in throttles for acceleration and braking in matching other traffic.
