It has already been done. Mel at Tandems East in NJ has been selling a modified Arai with the fins turned off for quite some time. I bought one in 2003. I don't know how long before that he was selling his modified Arai. Some say that the heat load is significantly diminished, some say that it was way overdesigned for a bicycle, since its original use was for a moped or something. I know mine has always been sufficient for our tandem use. I'd be interested in seeing your finite element results.