The PRONI Guide to Church Registers lists their holdings on microfilm.
https://www.nidirect.gov.uk/publications/guide-church-recordsand RootsIreland is an Irish site with transcriptions of certain periods of some parishes.
http://rootsireland.ie/armagh/online-sources.phpThe closest Church of Ireland church to the Lockhouse was/is Mullavilly in Kilmore Parish
https://www.genuki.org.uk/big/IRL/ARM/Kilmore/MullavillyParishChurchNote there are 3 churches in Kilmore and only the parishes with a black dates and a red tick are transcribed and online on RootsIreland. Mulavilly parish data exists from 1821 but only accessible in PRONI on microfilm (they offer a research service for a fee) or by contacting the parish
https://mullavilly.armagh.anglican.org/page-9/page11.htmlParish history
https://www.libraryireland.com/topog/M/Mullavilly-Lower-Orior-Armagh.phpThere is a chance that the pre-1821 records are included in the mother church of St Aidan's, Kilmore, further west. If so those exist from 1789 are transcribed on RootsIreland.
The next closest Church of Ireland are Seagoe Parish Portadown, whilst records date back to 1671, they are only online from 1821 and St Mark's, Ballymore Parish, Tandragee where registers date back to 1783 but again are not available online.
Presbyterian churches existed in Ballymore/Tandragee and Seagoe/Portadown but surviving registers are likely not old enough for you.
Really the question is what year is written in the account for William's birth in Maguiresbridge as that is an entirely different area and I would be dubious about linking the two and if Maguiresbridge is correct. Maguiresbridge in Co Fermanagh is rather distant from Moneypenny's Lock.
Maguiresbridge is in the large Parish of Aghalurcher but by its border with Aghavea Parish.
https://www.townlands.ie/fermanagh/magherastephana/aghalurcher/maguiresbridge/tattinderry/Is in Lisnaskea Registration District. There is only one single Civil Registration entry for a Moneypenny in Lisnaskea: death of a Joseph aged 102 in the Workhouse 1897 (allow a wide margin for Irish ages in records) and none in adjacent Enniskillen District. It was a remoter area, more R.C. (registers of which don't start till 1835-60's) & even harder to research.
Co Armagh and Belfast city were were the surname was recorded 1850-1864
https://www.johngrenham.com/findasurname.php?surname=Moneypenny