I’m no expert, but “as” seems to carry a meaning of physical, mechanical transition out of some structure, while “ó” is better in the spectrum of origin and need…
– Is mise Antaine Ó Tigh Mór. Is mo chara anseo an tUasal Ó Lochbruaigh.
– Tá uisce beatha uaim.
– Tá uisce reatha i mo theach. Rithfidh mo bhean amach dá fháil as tobar.
Gabhaigí mo leithscéal do mo bhotúin. Tá fáilte roimh cheartúcháin.