Don’t get me wrong, I love Bela’s playing and own many of his recordings.
You could replace gimmick with trick, lick. riff, approach, technique, or many other words. I just happened to use that one 'cause it is something that is fairly easy and works great to get peoples attention used once in a while but it can be over-used very easily.
Don Reno incorporated a fair amount of triplet playing in his style I believe.