If you want to change the position of the clutch arm in relation to the cam, you can, it won't damage anything and you can change it back too.
Remove the whole sprocket cover from the engine.
Clamp the arm or hold it securely so the clutch cam shaft and sprocket cover are hanging free.
Loosen the nut on the top of the clutch cam shaft, but don't remove it. The nut will protect the threads.
Hit the nut. A hammer is actually acceptable for this: probably the only place on a bike I would ever use one!
Then loosen the nut a little further and hit it again. You should see the splines on the clutch cam shaft starting to come out of the clutch arm. Remove the nut and pull the clutch arm off.
To put the arm back on you can probably do it just by pushing the arm onto the splines and tightening it down using the nut.
Hope this helps. Good luck with your project!