The Book of Common Prayer (Leabhar na hUrnaí Coitinne)
is available in the Irish language. I have a copy which was given to me a gift (from a Catholic priest!). What particularly impresses me is its use of the Sean-Chló.
You may also want to avail yourself of Canon Coslett Quinn's translation of the NT. Dr. Quinn is a Church of Ireland (Anglican) clergyman and has TWICE been elected as president of the Oireachtas na Gaeilge. Dr. Quinn strongly recommends scripture reading for those who are learning the language.
I find the CofI NT easier to read than the Maynooth translation.
There is an organisation within the CofI for Irish-speakers.
In fact, there is a CofI parish in Dublin that conducts services in Irish.
Foras na Gaeilge might be able to help you here: email@example.com