It shouldn't have any trouble controlling one or the other at a time. I'm not so certain about controlling both at once though. Setting up splits and zones might be a bit tedious too.
Sorry, I might have missed something, why would he need a merge box?
If atleast one of the two korgs are equipped with a "THRU" you won't even need to use a MIDI THRU box. Just novation MIDI OUT to KORG1 MIDI IN, KORG1 MIDI THRU to KORG2 MIDI IN and you're done. Unless I've misunderstood what the OP is after.
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