Eclipse has 3 internal MIDI maps. Each one is fully user_programmable. Presets on a card start from #500. You can assign any MIDI program change to any preset; so, for instance, MIDI Pr.Change #1 could recall preset #500 from the card.
I don't understand why you say:
"But I still need the event processor if I want to use the G-system to access any of the Eclipse patches on the memory card."