Slow practice is my only trick. Slow until the muscle memory kicks in. These rhythmic touches are a hard technique for me but once the muscle memory takes over and it becomes a part of my toolbox it is most rewarding. Sometimes I mute by releasing pressure on the strings with my fretting hand. Sometimes I try to place my pinky or ring finger across the strings. Sometimes I try palm muting with my strumming hand. Whatever technique feels easier after I experiment with it. I haven’t found a short cut.