GWguy
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Try a throttle boss.
It wraps around the end of your throttle, very easy on/off.
You rest the heel of your hand on it so you can relax your grip on the throttle.
... and you can get one at Motovations
I find the concept of locking the throttle in place is a little scary
Cruise control. Us big boys have 'em. Actually, I don't use it much. I still need to rest my hand on the throttle and wind up tripping it off. I just use it for quick breaks to stretch my hand.
I had a throttle lock on my GL1100, hated it. Never worked right. The Throttle Boss is a big improvement.