I did not know about the noise at highway speeds for the michelins. That is definitely a big issue. I noticed on the ERW wheels, they used a rubber membrane to reduce vibration.
Skip to 2:50 to see how they solved their vibration problem.
I believe the aerodynamics can easily be fixed with smooth wheel covers. and the portion around the edge where the space will change with each bump, can be covered with thin rubber.
If what ERW says it true, than michelin will not be able to sell their tweel because ERW has the patents. It's too bad because michelin is the one with all the money to get a product to market.