Both Lizard King's & Mariah's are good ideas.
I wouldn't use JB weld.
Am actually doing kind of what Mariah suggests on a current Harley project, with relieving some of the alum. inside the ID of lever mounts,, so the wire harnesses won't pinch that runs through them.
There is enough meat on that push button switch to remove enough material to fit the 1' bars.
Just might have to use smaller OD bolts or screws.