Any way the folks at VisaHQ can send the passport to your address in Hong Kong? If you have a month there that might be a good option. It is also possible that your passport would get there faster than you (FedEx can work wonders).
This seems the safest option by far. If your OKC-ATL flight were significantly delayed (we all know it happens) you could end up missing your connecting flight if you had to pick up your passport somewhere outside of security.