Thanks C_W,
I think it's the parish of Kirkmichael, just outside Lochmaben, Dumfries.
None of the monumental inscriptions matched my particular genealogy, so I think I'm okay for photos-but thank you so much for the generous offer!
I've pretty much decided with this genealogy to simply write up both options-including my references, as future genealogists may be able to sort it out.
1. Anne Harkness, born 1749 to Thomas Harkness and Janet Kirkpatrick (from OPR/Kirkmichael-still in the correct area).
2. or Anne Harkness, born 1749 to George Harkness and Anne Currie (from many other genealogists/ and she's in the correct area of Dumfriesshire, but Anne would have been 46 years old!).
Bit of a cop out but there it is!