Could you add two bars on at twice the original tempo. Then in these faster bars place on beats 1 then 3 & 4 and finish with beat 1 of second bar. I think that would work.
Might work, but not on those beats, I would describe the "chachacha" typical ending as hittin' on Twp, And & Three.
X///|//XX|X///| at twice the tempo via Bar Settings, Shots via Chord Settings.
Try also turning those chords into full Shots as well.
--Mac