Dear dh110953
I have one technique to "go around" this limtation, but it´s a litlle hard to play.
Create a second style , only one bar, with the parts that you need.
When the first style is playing the last bar before the changing in time signature, I press to call the second style, so the keyboard finish the bar of the first and goes to the second ( the one I create).
During the execution of this only one bar style, I change back to the first style, so the keyboard finish playing the second style and then goes back to the first style.
I told you it was hard.