Hi Dave, If you normally only use One of the Right hand voices at a time, then I can think of one way of achieving your aim.
Assume you have RT1 selected. If you then press the Part Select button for RT2 - the upper one - you can then select a new sound for RT2, which will be displayed on the screen, but it will not become active, until you press the RT2 Lower button. This will turn off RT1. You could then pre-select another voice for RT1, using the same procedure and it will only become active when you press the RT1 button.
This of course only applies to the Right hand sounds. I can't think of a similar system for the styles. You could possibly make use of Panel Memory set-ups and then select 'Bank View' page 3, which could be named to reflect your particular set-up.
There may be other methods, but I can't think of one at present
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If there are other ways to do this, I'm sure they will appear here
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Willum