Did you find out some of the above info from Ancestry? I see in the New South Wales Convict Registers of Pardons 1788 to 1880 there is a John Ford (aka Barry, aka Patrick Sexton). I couldn't locate a baptism online for a John Ford(e) in Co. Galway in the period 1813-1823.
Do you have a subscription for Find My Past - while there is a lot of cross over with Ancestry on record sets there might be something there to indicate a place within Galway on some of their records . They have a 14 day free trial.