I use the Harken Micro Traveler Cam Bracket that is designed for J/22s and Sonars. If you are not familiar with it, it has both a horizontal and vertical cam cleat on each side mounted on an L-bracket. The leeward traveler sheet does not need to be cleated. The windward traveler is set into the vertical cam for easy adjustment. As I begin to move across the tack, I release the windward sheet and set the leeward traveler into the horizontal cam as the traveler car slides down and approaches what will be the new setting. Once I have tacked and I have moved to the (new) windward side, I reset the traveler into the vertical cam cleat on the new side for convenient adjustment.
Actually, this part of the tack becomes second nature. Telling you how to move the traveler takes more time to say it than to do it, but it is quick, controllable, and smooth.