Witzgall...I've never heard of sailboats boats attempting those inlets. They have a nasty rep even among the power boaters. You might talk to the sport fishermen once down that way for local knowledge.
Here's the PDF of the Ocracoke Inlet from 11/08 from the ACOE
Once inside...the twists and turns and shoals have a bad reputation. Not well marked. ....
and here is Hatteras from 5/08
Depths are ok in both inlets but breaking seas and tidal currents against winds make these inlets tough. I think the inside depths are the biggest problem getting around in either of these inlets even on a good day that lets you through the inlet.
That's why I'd try to talk to some sport fishing guys to see what kind of depths you can expect to be able to carry inside.