I wonder if you could make the two-cylinder idea work if you got a crank and cam custom-made? Instead of having a crank throw every 120 degrees, you'd have one every 180 degrees. Similarly, you'd have the cam lobes made to actuate the valves 180 degrees of cam rotation apart. Quite pricey to have them custom made!!
Perhaps you could have a four-cylinder crank and/or cam cut down? Still not all that cheap, though.
Hmm... Just trying to brainstorm...
-soD
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