I'm not sure if you are aware - the LDS Family History Centre in Belfast is closed for renovations until January.
As well as BMD indexes for Northern Ireland, microfilms of the actual registrations are available:
Births 1864 - 1880 & 1900 - 1912
Deaths 1864 - 1870
Marriages 1845 - 1870.
If you have a digital camera, you can take photos of the enties, although a small number of the films are very poor quality ...
As far as I am aware, they don't have church records, but you can check that with them.