I agree with Victor, I have been able to convert many Yamaha styles to Korg Pa2xpro with much success. Some of the instrument choices and octave information had to be tweaked but you can do that right inside the keyboard saving it to itself. Some of the really complex intro's and endings of the better Yamaha styles may get truncated, but the core style sounds reasonably well.
I have put a few converted styles up on www.arrangerworld.com
and will put more if there is any interest. I've shared a few with StephenM. I now have every available User Bank filled in my Pa2xpro. The one cool thing about the Pa2xpro is you can use the sliders to turn down the volume of the accompaniment sounds and just leave the bass and drums playing in the style. This gives a nice combo sound to the style without all the other busy and sometimes annoying strumming accompaniment.
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Korg Pa2xpro, Roland VK8-M, DW Collectors Series Drums, Roland TD-12 Vdrums, Roland SPD-S.