I agree, it sounds like Walt should maybe plug some pedals into his 7k, switch off apc, use the organ tabs with keyboard split and he could play just like he used to on the organ?
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You could step record all your chord changes first and thus make the left hand completely independent of the chord recognition - chord step record can be incredibly fast, literally preparing a whole song in seconds once you are used to it.
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However there is another solution that preserves 'live' playing and requires a little practice but not as much effort as re-learning all your chord positions, and that is to use the footswitch set to apc hold, particularly in pianist mode.
Here you can play what you like in the left hand without inappropriately changing the harmony, just releasing the pedal when wanting to change to the correct chord at the place that you want