I am glad that makes some sense.
We definitely have a Flora McConachy otherwise known as Flora Duncan of Killean.
Our lines may yet prove to be connected in some way. I think the 1792 census might suggest something, but don't have it to hand.
Unless part of the 1779 censns I downloaded is missing, it is not very helpful for Kintyre.
Duncanson sounds like another way of saying MacDuncan or McConachy.
Only slightly related, I recently found a Duncan Mclean of about the right age in 1792 censns for Killean and need to check him out. Coming 'from Ireland' may not be the same a s being born there.