I did almost exactly what you said on mine. Somehow I broke that nub off on the throttle side, so I used some double-sided Gorilla tape. Worked like a champ.I'm the bad guy here! I usually use my rotary tool to take those annoying things off. Then I can position the thumb controls however I want on any handlebar.
A piece of friction tape or athletic tape (for gear not bodies) wrapped on the handlebar is all you need to keep the controls from slipping - especially the right side.
PS- I sent you a private message about the ACCT. Check you DM's when you get a chance!