Unless the style is written for a specific song, there's no way the arranger can know what you're going to play next. It only reacts to what you actually do play in real time. And it's a computer, so it will always give the same output for a given "input" (your chords.)
The newer Ketrons have some optional style control parameters that do interesting things with 6ths, 7ths, and the bass to be more authentic to certain genres of music. I'm not sure if you can change these parameters in the middle of a song. You might check this out if you can find a Ketron in a store to audition (or take a look at some of AJ's recent demos.)
Other options would be to add tensions to certain chords when you play the second verse. I.e., Cmaj7 or Cadd9 instead of C. I'm weak on music theory, not sure if this would work. Depending on the CASM (style pattern) you might get a different sound.
Activating RH harmony / ensemble aka "melody intelligence," and using strings with slow-ish attack for the 2nd voice might create an interesting effect on some ballads.
Finally, you could try using bass inversion if you're not already. Playing the chords in different inversions for the second verse, or substituting a relative minor chord can be used to force the bassline. In a lot of 70s singer-songwriter stuff, I find that a descending bassline is the 'counter-melody.' Yamahas have a mode called "AI Fingered" that's supposed to facilitate playing slash chords, 13ths, etc. You could experiment with this, and also the "AI Full Keyboard" mode. I'm not a pianist, and personally I find the latter a bit unpredictable. I'm also not sure if you can change these easily during a song (you might have to embed the chord recognition settings in registrations.)
Why not spend a few minutes experimenting, see what you get! My $.02.
Edited by TedS (06/11/20 01:33 PM)