I have a simple rule change proposal to address the eyesore TT helmets that we have to be subjected to in stage races: you can wear any (safety-approved) helmet you want in the TT of a stage race, but you must wear the same helmet in the next road stage. If there is no next stage, then you have to wear the same helmet as the prior stage. You want the aero advantage that badly, you have to live with the shame.
If the race is solely a TT and not part of a stage race, then the rule doesn’t apply because if you actually want to just do a TT, then we don’t need to make your day worse by not letting you indulge your fetish. It’s a stand-alone TT so nobody who you aren’t paying or married to is going to watch and have to see your ridiculous Dark Helmet lid anyway.
Is there already a rule prohibiting wearing TT helmets in road races? Probably. Is this serious? Not at all. But neither is the head-dong that Jonas and Pauline had to wear in front of millions of innocent people in their Tour TTs.