Yes, I see that that can work...I tested it here and then you have control on when it switches to the new OTS...instead of having the style element change do it. Looks like you do have to be careful that the sound has stopped completely before hitting the OTS button (1-4). Using Registrations I think will also work...but I have to play with that a little to be sure.
It's been a long time since I had the PA2XPRO, was the issue the same with Korg (Pa4X, now)?