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Technically, it's possible. Removing pistons 1&2 or 3&4 would keep it the "most balanced", as they are not companion cylinders (don't rise and fall together). But you would somehow have to block the oil gallery in the crankshaft where the rods would be missing.
There is little point in attempting this on a diesel, as diesel engines are far more efficient at light loads than gas engines and there is not much efficiency to be gained through cylinder activation. If I understand correctly, cylinder deactivation adds efficiency through a reduction in pumping losses, which isn't an issue in diesel engines.
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