The tax school I was at today said that sending the closing statement with the 8453 will not be allowed. Paper file return with HUD-1.
One suggestion they gave was, if the client otherwise would have a refund that they are eager for, leave out the credit, e-file, then paper file an amended later.
They also said that the IRS estimates up to 72% fraud on the $7500 home purchase credits, which is why they now require the HUD-1.