On my VTX I added the Kuryakyn Mechanical Throttle Cruise Assist to their ISO grips. If I didn't have the OEM cruise control I'd go back to this.

You just roll it back with your pinky finger and palm to tighten then you can move the throttle up or down to maintain speed. Push the bar end lock forward and it goes back to normal. I got used to turning it less than 1/2 a turn to lock and unlock.