OT
Hi Diki
Could you not record your chord sequence as a Midi file, and then store it in the style slot next to the style you are using, so that you can then just switch between them?
It may not be as flexible as a CS, but possibly a workaround.

Back to the question
Diki has summed it up pretty well, but there may be a possible workaround, (Not as flexible but might add a bit of flavour) most boards have a glide/pitch bend (Hawaiian Guitar Effect for Organ Players) that can be assigned to a footswitch, so just use this when your hands are tied up playing other things. (Most can have their length adjusted and stored in a preset)
Just a thought

Bill