I have one of those nosecone Shivs. I've gotten it down to .2 CdA on calm days according to Aerolab.
If I were going to Nationals I guess I would find a new frame but I'm hoping they relax some of the UCI guidelines and legalize it. They have already relaxed a bunch of guidelines and this model was originally designed to meet UCI specs until the McQuaid regime killed it (after it had won worlds with Cancellara).
I don't intend to go to Nats until I have seen TTs in the 29mph range (or possibly if they choose to have it in Pennsylvania again).