I had a brief conversation with Chris Gries at OSH owner of Diamond Aircraft.
Diamond is neck and neck with Sirus on being the second largest
light airplane manufacturer in the world. They are also the distant second largest
wankel engine builder with over 400 single rotor engines shipped
for motor glider use. Chris said they have no plans to market the
certified two rotor as it is too expensive to produce. You can send him
email and say you will pay $12,000 US and he might change his mind.
He does plan to sell an enlarged 75 HP single rotor version. 

Paul Lamar
 
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