Hi, Frank. Thank you for your response. I know how frustrating it is to research Irish records, believe me.
Interestingly, one of my John Fortune's sons, WIlliam Fortune, fled Camden District, SC between 1783 and 1811 for Canada (now Pointe Fortune) after a family scandal. The family had emigrated from Newry, Ireland to Charleston, SC in 1767.
I'd love to share what I have on William Fortune with you, maybe one day we'll find there is a connection. It wouldn't be implausible to think other Fortunes might have followed William to Canada, especially since we also know William returned to Ireland, possibly to educate his son. at some point between the above dates.