Build a 3 part voice using a nice pad and strings over the organ part. Assign the pitch bend lever to "bend" and set the organ bend range to "0". Set either "A" to 24 and "B" to 12 (or as desired) on the bend range. You can get some sweet slides over the organ chords etc.

Hey Yamaha, can you add the option to the bend range to only assign the bend to either the upper or lower organ as well as both?