Glad you found that information helpful.
With regard to the church records available on www.irishgenealogy.ie
, they only cover parishes in Counties Cork, Carlow, Dublin and Kerry.
Civil registration of all births, marriages and deaths started in Ireland in 1864, non-Catholic marriages were registered from 1845 so that may be why you are not finding any relevant results so as you have suggested, commissioning research may be the best way to proceed.
Ulster Historical Foundation