Well, when speaking of if it’s possible:
Loading a different arranger sequence is definitely not possible, because there is no way to trigger this from outside the OT. At least you need to have all songs in one large sequence and jump via SPP (Song Position Pointer) messages around.
Some further reading about SPP messages and the arranger:
I’m quite unsure if the MIDI Solutions Event Processor is up to the task, but something like the BomeBox in combination with the MIDI Translator Pro software will definitely be able to handle such “batch jobs”.