This is why so few DOs match these fields: people are assuming they don't have a chance going in. We're told all along that we don't have a chance, not to try, don't even bother, etc. Yet if you look at the interview numbers, a significant amount do interview DOs.
Last year 2 DOs matched ortho, 1 neurosurg, 1 vascular surg. Derm has taken DOs in the past. Ortho and neurosurg typically take a few. So to say definitively it's "not going to happen," is wrong.
I'm betting those number will go up significantly once the matches combine and so many DOs aren't being actively discouraged from ranking those ACGME specialties. How many DOs actually participated in the ACGME match for ortho, neurosurg, vascular surg, etc last year? That number's not available, but I bet it's not very many.