I had an old worm clutch actuator that came with the bike when I bought it. I've no idea what it was off, but the lever was quite a bit shorter than the XS650 lever.
I too have arthritis in my hands, and fused fingers, which makes it difficult to operate the clutch, So, I cut the spare actuator apart, turned up a round thing to hold the seal, made a lever slightly longer than the stock actuator and welded everything together.
It works great, my arthritic hands can handle the pul and the plates seperate, I'll have to wait unti I start the bike again tosee how it works.