I'm surprised that Yamaha keyboards still don't have a style restart button.
It's still hard to insert a 3/4 or 2/4 measure into a 4/4 song.
When I briefly owned a Solton X1 about 10 years ago, the one feature I loved about it was the restart button, so that wherever you were in a rhythm it would start at beat 1 as soon as you pressed the button - perfect for odd measures or for someone who's accompanying and playing too fast or two slow.
The only solution with Yamaha keyboards is to press the sync/start button and to play the next chord immediately so that there's no break. When you accidentally play the chord before the sync/start button, you get a horrible Oops silence.
This feature would seem to be a no-brainer.