Hope some one can point you to a lever you want.I personally don't have the Clutch lever switch on my bikes.Mine are shorted across and removed.
As my hands age I've developed a,"Thumb -Over" technique on my Clutch hand to rest it when out of traffic and at steady speed.By this I mean I raise my thumb from under the grip to on top and rest it and bring it back down when I know I'm going to need it.
These little bits of,"Rests" help a great deal I've found and the technique soon becomes 2nd nature.
I also have a,"Vista" cruise control on my Throttle side which I use from time-to-time
HTH