Hi Trevor!
My Bowe/s also settled in Jordan and I've researched them quite extensively for many years. Many Irish Bowe families also have Bowes branches, and it's not unusual to find both spellings in the records of the same family.
I'm in touch with another descendant of Richard Bowe of Jordan, NY, b 1820. Richard and his wife Johanna (Burrough) Bowe are on my tree because their daughter Johanna Bowe married a Patrick Kenney. He descended from a shared Kenney ancestor with me. My Bowes and these Kenneys intermarried twice one generation prior to Patrick.
This other Richard Bowe descendant and I haven't been able to discern whether or how our lines might connect back in Ireland, but given their close proximity in Jordan and intermarriages, I've always leaned in the direction of thinking they knew one another back in the homeland.
My Bowe/s (and the Kenneys) are from the area between Ballyragget and Castlecomer, Kilkenny. A Bowe cousin, who is one of the ones who married one of the Kenney sisters, and who also settled in Jordan, is found in Ireland just over the Laois border, where a couple of his children were baptised.
I'm really interested in how you found Richard Bowe in Rossenarra Demesne Kilmaganny, which is quite a distance from where my Bowe/s are from. This will also interest the other person I know who descended from Richard, since he doesn't have any info about his origin in Ireland.
I have a "Verified Transcript from the Register of Deaths" in Onondaga Co for Richard. It says he died on Dec 11, 1893 at the age of 82. He was a married and his occupation was given as laborer. He died of pneumonia. He was from Ireland and his father was Thomas. His mother's name isn't filled in. Does the record you have from Kilmaganny happen to name a father Thomas?
Unfortunately I can't figure out a way to contact you without sharing an email on the web, which I don't want to do.
Do you happen to have your family tree online where I could view it?
Hope to hear back, Martha