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Course not - there's no money in it!
That wouldn't stop an amateur from testing it. Of course, many people want to wear a helmet regardless, so they aren't going to test something they'd never use in a race.
What little evidence I've seen points to a shaved bare head being about equal to an well selected aero helmet, but a good head fairing beats either. As you suggest, the weakness of any "safety" helmet is that it significantly increases the frontal area, so it has to reduce the drag coefficient by a similar factor just to break even.
gbj_tester
Course not - there's no money in it! The last message a manufacturer wants to see is that their super aero helmet is better than all the competition, but worse than nothing, or than a cheap fairing. But a road helmet has got to be worse - its more or less doubling the size of your head!