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Boy, this is a tough one!!
The Korg EC5 is like the Roland FC-7 also NOT Midi, but just "analog" switches....
You need to (let) make a cable specific for Roland Arrangers.
Especially with arrangers, basically assume that you already know more than they do... It's probably true!
However, there's a sort of workaround using the FC-7 inputs. Set up four Performances (UPG's) next to each other in the Performance List (UPS) derived from the OTS settings. Now set two FC-7 switches to do Perf Up/Down. You can now switch seamlessly through the UPG's as if you were hitting the OTS buttons...
In fact, it's a bit better than the four switch system, as it only uses two up (if all you have is five, you quickly run out of options for the other button, as FC-7 assignments are global, not per UPG). You can step through them VERY quickly if you need to go to more than the adjacent Variation. But yes, it does take setting up in advance.